MFPLI00097S The precision arguments of BINARY, DECIMAL, FIXED, FLOAT, DIVIDE, MULTIPLY, ADD, and SUBTRACT built-in functions must be decimal integer constants.

Only decimal integer constants can be specified as precision arguments to the arithmetic built-in functions.
Resolution:
If different precisions are required depending on particular conditions then use a SELECT statement to choose between evaluating expressions using the arithmetic built-in function with different integer constant precision arguments.
Module:
INTRP2.PL1, RESIS.PL1