Selection criterion "&1" contains multiple selection lines

What causes this issue?

Several selection lines exist for the selection criterion "&V1&", but
the program stipulates only one line, i.e. no 'Multiple selection' is
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.