Hi Geneviee,
In exit FEB00001 you can populate field e_febep-zuonr with profit center code (I assume you can derive from EBS which profit center belongs to each transaction).
If posting rule was customized to clear at upload EBS, then you should also insert an entry in the t_febcl table with correct values (see EBS- Clearing document number vs. "chect" field in Multicash format).
If no clearing was customized for posting rule, then just populate e_febep-zuonr. Clearing be done later with F.13.
Best regards!