Minor Error Encountered When Generating SapScript

Hi Experts!

I am currently revising a sapscript form that is a cheque layout, which is a copy of the sapscript F110_PRENUM_CHCK. During testing, even though the form is coming out ok, I keep getting an error log containing this:

<b>In form Z110_AU_CHEQUE / window MAIN, the elemtn 510-X (Text-X) is missing</b>

Now, I already inserted an element namend 510-X in the MAIN window, but it still returns this error message. I also tried running the original form, it also has this error.

Has anyone encountered something like this? If yes, can you please tell me how you addressed this problem?

Thanks in advance.