Insufficient space for loop continuation lines

What causes this issue?

You can only increase the loop factor if there is an adequate number of
blank lines for the next loop block.

How to fix this error?

If a loop factor has not been specified, you may have to define the
bottom line of a multi-line block with F16 first. You can terminate the
definition procedure by leaving the loop mode with F3.

Error message extract from SAP system. Copyright SAP SE.