SAP Message RSDODSO409 - Selection criteria: Character "&1" is not valid

Diagnosis
The table with the selection criteria contains the character &V1& thatdoes not belong to the valid values listed below.

System Response
An error message is displayed, and the control data is given for theprogram that was called.

Procedure
Make sure that the character (field SIGN) is among the followingvalues:
'E' = exclude
'I' = include