Interunit elimination documents

Hi Friends

I wonder if is correct that the documents of Interunit Elimination appear after execute balance carry forward?

example

I have a document for interunit elimination in period 12 and then I execute Balance carryforward (period 1)and execute the task "acc recev Vs account Pay" and the total data from this item still appear.

Is necesary to do the task "period initialization"?

Thanks in advance

cheers