Unable to perform line break in program code

What causes this issue?

The code line contains more than 255 characters as a result of variable
replacements. This requires a line break that is not possible because
of a missing blank character.

System Response

Generation is interrupted.

How to fix this error?

If this error occurs although the template line contains a blank
character, contact SAP.

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

Error message extract from SAP system. Copyright SAP SE.