Semicolon missing

What causes this issue?

The system syntax check found an error in a list - items in the list
should be separated by semicolons.
The system expects a semicolon at the cursor.

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?

Check the expression at the cursor and enter a semicolon as separator
character if required. Please also take not of other possible sources
of errors (messages).

Error message extract from SAP system. Copyright SAP SE.