SAP Message VL640 - Stock determination failed during goods issue: return code &

Diagnosis
The stock determination for the goods issue posting has beenunsuccessful.

System Response
The function module BF_STOCK_DETERMINATION issued a return code notequal 0, that is, an error occurred.

Procedure
Using the return code, check out the error:
NO_MATERIAL = 1
NO_PLANT = 2
NO_APPLICATION = 3
FUNCTION_NOT_POSSIBLE = 4
CONDITION_NOT_FOUND = 5
CLASSTYPE_NOT_FOUND = 6
CLASSTYPE_NOT_ACTIVE = 7
NO_BASE_UNIT = 8
NO_UNIT = 9
CONVERSION_NOT_FOUND = 10
CONVERSION_OVERFLOW = 11
MISSING_ENTRY_T156C = 12
CONVERSION_TYPE_INVALID = 13
DIVISION_BY_ZERO = 14
DATA_MISMATCH = 15
MATERIAL_NOT_FOUND = 16
NO_QUANTITY = 17
OTHERS = 18

382640MB26:RC=8 stock determination after selctn w/ MRP controller