You don't mention if both workflow steps are loading to the same Entity. I am assuming they are, based on the error message.
If they are, and the ONLY difference is that Workflows A and B target different accounts but within the same data unit, then you should assign Workflow Channels to the Import profiles, and assign these channels also to the accounts.
That way , the import process will know that you are targeting only a subset of accounts each time, and it knows exactly which subset of accounts to clear each time. Otherwise, how does OneStream know which accounts need to be cleared in Profile A, or Profile B.
Please refer to the Design & Reference Guide, chapter "Using Workflow Channels" for more information.
