Multi Order Receipts lets one delivery from a vendor produce one receipt document. Business Central normally posts a separate receipt for every purchase order; with this app the lines of several orders end up on the same posted receipt — the one that matches the delivery note in the driver's hand.
Use it to:
The field and button names below are those shown when the English language is active.
Page: Warehouse Setup → General section
Action: turn on Combine Receipts.

What happens: every warehouse receipt created from now on starts with combining switched on. The setting is only the default — each warehouse receipt carries its own Combine Receipt toggle that you can turn off for that document alone (see section 2).
Existing warehouse receipts are not touched: they keep the value they were created with. (The Combine Shipments toggle beside it belongs to a different app, Multi Order Shipments, and does the same job on the outbound side.)
If you never receive through warehouse receipts, you can leave this off and work order by order instead (see section 3).
This is the automatic route: you register the delivery as usual, and the receipt document decides on its own that everything on it arrived together.
Page: Warehouse Receipt
Action: build the receipt as you always do — Get Source Documents… to pull in the lines of as many purchase orders as the delivery covers — check that Combine Receipt is on, then post it.

In the picture, receipt RE000026 carries lines from orders 106094, 106095 and 106096, and Combine Receipt is on.
What happens: all the orders on the document are posted onto a single posted purchase receipt instead of one each. Everything else — quantities, item ledger entries, the orders themselves — behaves exactly as it always has.
The app steps back and lets Business Central post normally when:
Before posting, the app checks that all the orders on the document agree on four things:
If one of them differs, posting stops with the usual "must be equal to…" message naming the field, and nothing is posted. Take the odd order off the warehouse receipt and post it on its own.
This is the manual route, order by order — useful when goods turn up against a delivery you have already posted.
Page: Purchase Order → Shipping and Payment section
Action: in Append-To Rcpt. No., pick the posted receipt the order should join, then post the order with Receive.

What happens: the order's lines are added to that posted receipt instead of creating a new one, and Append-To Rcpt. No. is emptied automatically once the order is posted — so the field never fires twice.
The lookup only offers receipts the order can actually join: same buy-from vendor, same pay-to vendor, same receiving number series, and the same posting date as the order. If the list is empty, one of those four is different — most often the date.
Page: Posted Purchase Receipt
One document now holds the lines of every order that was combined into it.

Two things are worth knowing when you read it:
Invoicing is untouched: invoice each order the usual way, or pull the lines of the combined receipt into one invoice with Get Receipt Lines.
Inbound transfers work the same way, and with no setting to turn on.
Page: Warehouse Receipt made only of inbound transfer lines
Action: post it as usual.
What happens: all the transfer orders on the document are posted onto a single posted transfer receipt. Here the app checks that the orders share:
As with purchase orders, posting stops if one of them differs. Note that for transfers the combining does not depend on Combine Receipts in Warehouse Setup, and there is no field on the transfer order for choosing a receipt by hand: a warehouse receipt made only of inbound transfer lines is always combined.