When you try to test a function module via SE37 you get runtime error, but it works fine when incorporated in a...
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This happens especially after an upgrade. The table EUFUNC which contains test data gets corruped for some unknown cause. The solution is one of two:
1. Clear the EUFUNC table (to be done by a BASIS person)
2. Remove the affected entry of the table EUFUNC with:
SE37, Function Module -> Test environment -> Delete test data.
Then test the function module. It will work just fine.