Function & not defined in "select block" mode

What causes this issue?

Within the framework of interactive reporting, you have requested
function &V1&. However, this has not been defined or is not allowed in
"Select block" mode.

System Response

Function &V1& could not be performed.

How to fix this error?

If you did not request function &V1& through manual input, this message
is due to a program error. If necessary, contact your system
administrator.

Error message extract from SAP system. Copyright SAP SE.