Selection criterion "&1" contains an invalid selection line

What causes this issue?

Although selections exist for the selection criterion "&V1&", they can
be processed neither on the selection screen nor on the 'Multiple
selection' screen because of restrictions in the application program.
The line in question has the sign "&V2&" (field SIGN) which is not
allowed on the main selection screen. 'Multiple selection' is not
allowed for &V1&.
There is probably an error in the application program.

System Response

The processing had to be terminated.

How to fix this error?

Contact either the developer responsible for the program or your SAP
consultant.

Error message extract from SAP system. Copyright SAP SE.