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Automatic consolidation requires the following fields on orders/shipments to be identical: CustAccount, DeliveryName, InventLocationId, modeCode, and tmpAddress.RecId

https://blogs.msdn.microsoft.com/dpaxfeatures/2016/06/28/practical-experiences-on-implementing-the-whs-warehouse-module-consolidating-shipments/

The issue with this is if I have Company 1 as shipping company and Company 2 as Receiving company.
I create PO in CO. 2 which automatically creates SO in CO. 1 based on standard Intercompany vendor/customer trading relationship configuration. I then create a SO in CO. 1 which automatically creates the PO in CO. 2. The delivery address on both Sales orders in CO. 1 is identical, however, has difference tmpAddress Rec IDs because technically it is two different address records.

When you run the Automatic release of sales orders to create shipments, the orders will not consolidate. Also, you can not manually consolidate the orders because of this limitation. This means organizations have to create all Intercompany orders in the same sequence otherwise, you cannot consolidate the IC customer sales orders that were created differently. An enhancement should be created to address and allow for this scenario.
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