If a Central Receiver is added to the organization in ASTRA, they will begin receiving notifications when a receipt is created and be able to receive on a BPO the day after the role assignment in ASTRA.
When a BPO is created, the first receipt (RCxxxxxx) is also created at that time, and the receipt is thus able to be accessed for receiving only by those that have receiving ability when that receipt was created. Since only the Preparer and Contact (Requester) have the receiving ability automatically for BPOs, these are the people who will receive on the BPO.
If a BPO is created, and later a Central Receiver is assigned in ASTRA, the Central Receiver will not have access to receipts prior to their activation date. They will only have the receiving ability for receipts created the day after the role is assigned in ASTRA.