Diagnosis
This error occurs if the "+/- sign" field is not correctly maintained
in customizing for a transaction type.
The table concerned is TZB0A.

Procedure
Change the customizing table or inform your system administrator. You
reach the corresponding table via the following menu options:
Tools -> Customizing -> Configuration -> Accounting ->
Treasury -> Loans -> Master data -> Transac.types -> Definition
IF &DEVICE& = 'SCREEN'.
Execute function
ENDIF.