Running a script freezes filemaker

[tmalanum]

Whenever I run the following script, FileMaker freezes, and sometimes shuts down.

Go to field [Catalog Number]

Relookup Field Contents [no dialogue; Catalog Number]

Catalog number is a unique value only field. At times we have had to re-create records that were deleted. When I do enter in information, I get this error:

"Catalog Number:" is defined to contain unique values only. Allow this duplicate value?

I do not understand how it is a duplicate value. I searched throughly for those missing records.

I think my script problem stems from the duplicate value problem in the "catalog number" field. I'm still a novice with FMP, so any information would be appreciated to solve either one of my problems.

Please let me know if you need more information.

Thanks.

Theresa