Delete fields on ztable

good day gurus.

i made a ztable having 7 fields. After which, I activated and nothing goes wrong. No error at all. However, I decided to delete one field of my ztable.. Now there is now error which states:

TABL ZAP_OR_LIST was not activated

Check table ZAP_OR_LIST (08-0309/10/06/08/15:41)

Old key field ZLISTID has been deleted

Structure change at field level (convert table ZAP_OR_LIST)

Check on table ZAP_OR_LIST resulted in errors

This is my first time to encounter this problem. I search the forum but I havent found an answer to my question.

Please help me what to do to solve this problem.

Thanks a lot.