Selection could not be completely copied

What causes this issue?

The specified selection could not be completely copied into the row
selection area. This happens if:
1) The selection parameter to be filled does not exist.
2) The selection parameter to be filled does not allow entry in an area.
3) The selection parameter does not allow multiple selection.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.