You have to understand that by deleting all your doing is removing from the SY_User file. Each record in historical files has the salesperson code as a field. That field will never be cleared, the data will always remain there.

AR_Salesperson, not SY_User. 

Transaction data might be fine.  Some reports may break if they rely on AR_Salesperson values.

EDIT: Nevermind - I think I figured it out.... will update soon

EDIT: Nevermind - I think I figured it out.... will update soon

Any Sage report that links to the business object for AR_Salesperson would have unpredictable results for a missing SP record.

OK so no problems running Customer Sales History or any of the other standard Sage reports.

I was just overestimating the CPU resources of my test environment. I narrowed the parameters and was more patient with the next run, it completed with accurate data.

It will still show totals for the deleted salesrep record.... it just isn't able to lookup the salesrep's name to populate it on the report next to the initials. 

So far, so good - still looking for a reason NOT to do this but I haven't found one so far.

These salesreps have unused since pre-2021 but just to be safe I think I might try to do July month-end early in the test environment to see if there are any issues.