Resolving Lookalike Account Errors in Data Tables: Seeking Guidance

I'll start by saying thus channel has become my go to for all challenges which is amazing - 🙂 I encountered a 'newby' problem today. Table A = list of 70 accounts. Ran a lookalike and posted to table B. Wanted to write the lookalike accounts in table B back to table A. Kept getting an error. I realised if the new accounts were posted to table A it would create a circle look-up as the lookalike enrichment was still active on table A. I turned off auto-update, however the problem continued. It was only when I deleted the lookalike column that I could write to table A. This is probably not the correct process. What should I have done?