diff --git a/CMakeLists_files.cmake b/CMakeLists_files.cmake
index c61784a57..ce8bd5300 100644
--- a/CMakeLists_files.cmake
+++ b/CMakeLists_files.cmake
@@ -545,6 +545,10 @@ if(ENABLE_ECL_INPUT)
     tests/SPE1CASE1_RST60.UNSMRY
     tests/MODEL2_RESTART.DATA
     tests/restart/MODEL2.UNRST
+    tests/UDQ_WCONPROD.DATA
+    tests/UDQ_WCONPROD.DATA
+    tests/UDQ_WCONPROD_RESTART.DATA
+    tests/UDQ_WCONPROD.X0006
   )
   list (APPEND EXAMPLE_SOURCE_FILES
     examples/opmi.cpp
diff --git a/tests/UDQ_WCONPROD.DATA b/tests/UDQ_WCONPROD.DATA
new file mode 100644
index 000000000..f6057f23a
--- /dev/null
+++ b/tests/UDQ_WCONPROD.DATA
@@ -0,0 +1,578 @@
+RUNSPEC
+TITLE
+  'Generic' 'Reservoir'
+NOECHO
+DIMENS
+ 3 5 4 /
+START
+ 22 'AUG' 2018 /
+OIL
+GAS
+WATER
+DISGAS
+METRIC
+TABDIMS
+ 1 1 130 24 1 20 /
+EQLDIMS
+ 2 100 20 /
+WELLDIMS
+ 230 120 50 80 /
+UNIFIN
+UNIFOUT
+UDQDIMS
+ 50 25 0 50 50 0 0
+ 50 0 20 /
+UDADIMS
+ 10 1* 10 /
+GRID
+NOECHO
+INIT
+GRIDFILE
+ 0 1 /
+MAPAXES
+ 0 100 0 0 100 0 /
+NOECHO
+SPECGRID
+ 3 5 4 1 'F' /
+COORD
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+PORO
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+ 1000 1000 1000 1000 1000 1000 1000
+ 1000 1000 1000 250 250 250 250
+ 250 250 250 250 250 250 250
+ 250 250 250 250 /
+COPY
+ 'PERMX' 'PERMY' /
+ 'PERMX' 'PERMZ' /
+/
+MULTIPLY
+ 'PERMZ' 0.1 /
+/
+MULTZ
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+/
+PVTW
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+ROCK
+ 383 4.12e-05 /
+DENSITY
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+SOLUTION
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+RPTRST
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+ /
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+ 'UPPER' 'LOWER' /
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+WULPRL
+ 'OPL01' 'OPL02' 'OPU01' 'OPU02' /
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+ 'OPL01' 'OPL02' 'OPU01' 'OPU02' /
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+ 'UPPER' 'TEST' /
+ 'LOWER' 'TEST' /
+/
+WELSPECS
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+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'OPU02' 'UPPER' 1 4 2002 'OIL' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'OPL01' 'LOWER' 1 2 2025 'OIL' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'OPL02' 'LOWER' 1 4 2025 'OIL' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+/
+WELSPECS
+ 'WIU01' 'UPPER' 3 3 2030 'WATER' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'WIL01' 'LOWER' 3 3 2050 'WATER' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+/
+COMPDAT
+ 'OPU01' 1 2 1 1 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'OPU02' 1 4 1 1 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'OPL01' 1 2 3 3 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'OPL02' 1 4 3 3 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'WIU01' 3 3 2 2 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'WIL01' 3 3 4 4 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+/
+WCONPROD
+ 'OPU*' 'SHUT' 'GRUP' 1500 2* 2500 1*
+ 60 /
+ 'OPL*' 'SHUT' 'GRUP' 1500 2* 2500 1*
+ 60 /
+/
+WCONINJE
+ 'WIU*' 'WATER' 'SHUT' 'GRUP' 10500 1* 400 /
+ 'WIL*' 'WATER' 'SHUT' 'GRUP' 10500 1* 400 /
+/
+UDQ
+ DEFINE 'WUOPRL' (WOPR OPL01 - 150) * 0.90 /
+ DEFINE 'WULPRL' (WLPR OPL01 - 200) * 0.90 /
+ DEFINE 'WUOPRU' (WOPR OPU01 - 250) * 0.80 /
+ DEFINE 'WULPRU' (WLPR OPU01 - 300) * 0.80 /
+ UNITS 'WUOPRL' SM3/DAY /
+ UNITS 'WULPRL' SM3/DAY /
+ UNITS 'WUOPRU' SM3/DAY /
+ UNITS 'WULPRU' SM3/DAY /
+/
+GCONPROD
+ 'TEST' 'LRAT' 6000 2* 6000 'RATE' 'NO' /
+ 'LOWER' 'FLD' 6000 2* 6000 'RATE' 'YES'
+ 1* 'FORM' /
+ 'UPPER' 'FLD' 3000 2* 6000 'RATE' 'YES'
+ 1* 'FORM' /
+/
+GCONINJE
+ 'LOWER' 'WATER' 'VREP' 3* 1.2 /
+ 'UPPER' 'WATER' 'VREP' 3* 1.2 /
+/
+GUIDERAT
+ 0 'OIL' 1 0.5 1 1 0
+ 0 'YES' 0.5 /
+WCONPROD
+ 'OPL02' 'OPEN' 'GRUP' 'WUOPRL' 2* 'WULPRL' 1*
+ 60 /
+/
+WCONPROD
+ 'OPU02' 'OPEN' 'GRUP' 0 2* 0 1*
+ 60 /
+/
+WELTARG
+ 'OPU02' 'ORAT' 'WUOPRU' /
+ 'OPU02' 'LRAT' 'WULPRU' /
+/
+DATES
+ 1 'SEP' 2018 /
+/
+WELOPEN
+ 'OPL01' 'OPEN' /
+/
+DATES
+ 1 'OCT' 2018 /
+/
+WELOPEN
+ 'WIL01' 'OPEN' /
+/
+DATES
+ 1 'NOV' 2018 /
+/
+WELOPEN
+ 'OPL02' 'OPEN' /
+/
+DATES
+ 1 'DEC' 2018 /
+/
+WELOPEN
+ 'OPU01' 'OPEN' /
+/
+DATES
+ 1 'JAN' 2019 /
+/
+WELOPEN
+ 'OPU02' 'OPEN' /
+/
+DATES
+ 1 'FEB' 2019 /
+/
+WELOPEN
+ 'WIU01' 'OPEN' /
+/
+DATES
+ 1 'MAR' 2019 /
+ 1 'APR' 2019 /
+ 1 'MAY' 2019 /
+ 1 'JUN' 2019 /
+ 1 'JUL' 2019 /
+ 1 'JAN' 2020 /
+/
diff --git a/tests/UDQ_WCONPROD.X0006 b/tests/UDQ_WCONPROD.X0006
new file mode 100644
index 000000000..888a620bb
Binary files /dev/null and b/tests/UDQ_WCONPROD.X0006 differ
diff --git a/tests/UDQ_WCONPROD_RESTART.DATA b/tests/UDQ_WCONPROD_RESTART.DATA
new file mode 100644
index 000000000..f640b58e3
--- /dev/null
+++ b/tests/UDQ_WCONPROD_RESTART.DATA
@@ -0,0 +1,575 @@
+RUNSPEC
+TITLE
+  'Generic' 'Reservoir'
+NOECHO
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+ 3 5 4 /
+START
+ 22 'AUG' 2018 /
+OIL
+GAS
+WATER
+DISGAS
+METRIC
+TABDIMS
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+EQLDIMS
+ 2 100 20 /
+WELLDIMS
+ 230 120 50 80 /
+UNIFOUT
+UDQDIMS
+ 50 25 0 50 50 0 0
+ 50 0 20 /
+UDADIMS
+ 10 1* 10 /
+GRID
+NOECHO
+INIT
+GRIDFILE
+ 0 1 /
+MAPAXES
+ 0 100 0 0 100 0 /
+NOECHO
+SPECGRID
+ 3 5 4 1 'F' /
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+ 310.9 371.44 1.903 0.2265 406.44 1.885 0.2333
+ 441.44 1.868 0.2401 476.44 1.853 0.2468 /
+ 353.3 401.66 2.013 0.2071 436.66 1.993 0.2132
+ 471.66 1.975 0.2192 /
+/
+PVTW
+ 344.83 1.0292 4.002e-05 0.36 0 /
+ROCK
+ 383 4.12e-05 /
+DENSITY
+ 842.3 1001.1 0.9 /
+REGIONS
+EQLNUM
+ 1 1 1 1 1 1 1
+ 1 1 1 1 1 1 1
+ 1 1 1 1 1 1 1
+ 1 1 1 1 1 1 1
+ 1 1 2 2 2 2 2
+ 2 2 2 2 2 2 2
+ 2 2 2 2 2 2 2
+ 2 2 2 2 2 2 2
+ 2 2 2 2 /
+SOLUTION
+RESTART
+ 'UDQ_WCONPROD' 6 /
+RSVD
+ 1500 180 4000 180 /
+ 1500 180 4000 180 /
+RPTRST
+ 'BASIC=2' 'PBPD' /
+SUMMARY
+FOPR
+FOPRH
+FGPR
+FGPRH
+FWPR
+FWPRH
+FWIR
+FWIP
+FOIP
+FGIP
+FWCT
+FWCTH
+FGOR
+FGORH
+FPR
+RPR
+ /
+ROIP
+ /
+ROIPL
+ /
+ROIPG
+ /
+RGIP
+ /
+RGIPL
+ /
+RGIPG
+ /
+RGPR
+ /
+RGPT
+ /
+GWIR
+ /
+GVIR
+ /
+GOPR
+ /
+GWPR
+ /
+GLPR
+ /
+GLPR
+ /
+GVPR
+ /
+WOPR
+ /
+WOPRH
+ /
+WGPR
+ /
+WGPRH
+ /
+WWPR
+ /
+WWPRH
+ /
+WOPT
+ /
+WWPT
+ /
+WGPT
+ /
+WOPTH
+ /
+WWPTH
+ /
+WGPTH
+ /
+WWCT
+ /
+WWCTH
+ /
+WGOR
+ /
+WGORH
+ /
+WWIR
+ /
+WWIRH
+ /
+WGIR
+ /
+WGIRH
+ /
+WWIT
+ /
+WWITH
+ /
+WGIT
+ /
+WGITH
+ /
+WBHP
+ /
+WTHP
+ /
+WPI
+ /
+WVPR
+ /
+WBP
+ /
+WBP4
+ /
+WBP9
+ /
+WMCTL
+ /
+WLPR
+ /
+FMWIN
+FMWPR
+GMWPR
+ 'UPPER' 'LOWER' /
+GMWIN
+ 'UPPER' 'LOWER' /
+WUOPRL
+ 'OPL01' 'OPL02' 'OPU01' 'OPU02' /
+WULPRL
+ 'OPL01' 'OPL02' 'OPU01' 'OPU02' /
+WUOPRU
+ 'OPL01' 'OPL02' 'OPU01' 'OPU02' /
+WULPRU
+ 'OPL01' 'OPL02' 'OPU01' 'OPU02' /
+SCHEDULE
+SKIPREST
+GRUPTREE
+ 'UPPER' 'TEST' /
+ 'LOWER' 'TEST' /
+/
+WELSPECS
+ 'OPU01' 'UPPER' 1 2 2002 'OIL' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'OPU02' 'UPPER' 1 4 2002 'OIL' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'OPL01' 'LOWER' 1 2 2025 'OIL' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'OPL02' 'LOWER' 1 4 2025 'OIL' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+/
+WELSPECS
+ 'WIU01' 'UPPER' 3 3 2030 'WATER' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+ 'WIL01' 'LOWER' 3 3 2050 'WATER' 0
+ 'STD' 'SHUT' 'YES' 0 'SEG' /
+/
+COMPDAT
+ 'OPU01' 1 2 1 1 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'OPU02' 1 4 1 1 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'OPL01' 1 2 3 3 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'OPL02' 1 4 3 3 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'WIU01' 3 3 2 2 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+ 'WIL01' 3 3 4 4 'OPEN' 0
+ 1* 0.241 1* 2.5 0 'Z' /
+/
+WCONPROD
+ 'OPU*' 'SHUT' 'GRUP' 1500 2* 2500 1*
+ 60 /
+ 'OPL*' 'SHUT' 'GRUP' 1500 2* 2500 1*
+ 60 /
+/
+WCONINJE
+ 'WIU*' 'WATER' 'SHUT' 'GRUP' 10500 1* 400 /
+ 'WIL*' 'WATER' 'SHUT' 'GRUP' 10500 1* 400 /
+/
+UDQ
+ DEFINE 'WUOPRL' (WOPR OPL01 - 150) * 0.90 /
+ DEFINE 'WULPRL' (WLPR OPL01 - 200) * 0.90 /
+ DEFINE 'WUOPRU' (WOPR OPU01 - 250) * 0.80 /
+ DEFINE 'WULPRU' (WLPR OPU01 - 300) * 0.80 /
+ UNITS 'WUOPRL' SM3/DAY /
+ UNITS 'WULPRL' SM3/DAY /
+ UNITS 'WUOPRU' SM3/DAY /
+ UNITS 'WULPRU' SM3/DAY /
+/
+GCONPROD
+ 'TEST' 'LRAT' 6000 2* 6000 'RATE' 'NO' /
+ 'LOWER' 'FLD' 6000 2* 6000 'RATE' 'YES'
+ 1* 'FORM' /
+ 'UPPER' 'FLD' 3000 2* 6000 'RATE' 'YES'
+ 1* 'FORM' /
+/
+GCONINJE
+ 'LOWER' 'WATER' 'VREP' 3* 1.2 /
+ 'UPPER' 'WATER' 'VREP' 3* 1.2 /
+/
+GUIDERAT
+ 0 'OIL' 1 0.5 1 1 0
+ 0 'YES' 0.5 /
+WCONPROD
+ 'OPL02' 'OPEN' 'GRUP' 'WUOPRL' 2* 'WULPRL' 1*
+ 60 /
+/
+WCONPROD
+ 'OPU02' 'OPEN' 'GRUP' 0 2* 0 1*
+ 60 /
+/
+WELTARG
+ 'OPU02' 'ORAT' 'WUOPRU' /
+ 'OPU02' 'LRAT' 'WULPRU' /
+/
+DATES
+ 1 'SEP' 2018 /
+/
+WELOPEN
+ 'OPL01' 'OPEN' /
+/
+DATES
+ 1 'OCT' 2018 /
+/
+WELOPEN
+ 'WIL01' 'OPEN' /
+/
+DATES
+ 1 'NOV' 2018 /
+/
+WELOPEN
+ 'OPL02' 'OPEN' /
+/
+DATES
+ 1 'DEC' 2018 /
+/
+WELOPEN
+ 'OPU01' 'OPEN' /
+/
+DATES
+ 1 'JAN' 2019 /
+/
+WELOPEN
+ 'OPU02' 'OPEN' /
+/
+DATES
+ 1 'FEB' 2019 /
+/
+WELOPEN
+ 'WIU01' 'OPEN' /
+/
+DATES
+ 1 'MAR' 2019 /
+ 1 'APR' 2019 /
+ 1 'MAY' 2019 /
+ 1 'JUN' 2019 /
+ 1 'JUL' 2019 /
+ 1 'JAN' 2020 /
+/