Function single execution (not  in parallel)

Hi All,
in a dataflow, I´ve 2 source tables , each of them with a query and with the respectively target table.
but in the both queries, there is a call to the same function (that generates an ID from a table) and I got a n error (same ID) because two queries is executed at the same time, generating corrupted data.
So, I deactivated "Enable parallel execution" from my custom function but with no success.
any idea? I can use another DF but Im trying to reduce the # of objects.
Thanks in advance!

I think "Enable Parallel Execution" option is per transform, for example of you set DOP to > 1 then for same Query transform multiple instances will be created, if a mapping in that query uses this function and its not enabled for parallel execution then it will not be part of the parallel execution plan
In your case, each source->Query->target are parallel streams, the option will be effective within a stream not across, how is the sequence generated from database ? is there no locking mechnism for that ?
even if you split the ops in 2 DF, if they are runnig in parallel then you may run into same issue.

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