Hi Tom,
the replication of BPs is triggered in the BAdI PARTNER_UPDATE. The default implementation provided by SAP checks if a partner is created or changed and triggers a BDoc to insert or update a BP. In order to perform an initial sending of a BP when the deletion flag is removed you'll need to implement a custom implementation of this BAdI.
To trigger the initial replication of a BP from ERP to CRM the function module com_bupa_mwxt_create_main_bdoc
can be used. Check the report com_bupa_send_bp to see how to use this function module.
Christian