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There is an API GET /Parts in PTC Product Management Domain which can be used with filter EndItem and Context Name to get End Items of specific product.
From the PDMLinkProduct object call getProduct(). This will return a WTPastMaster of the primary End Item if it was set. If you are looking for all of them, I would do a Query in that context for all Parts that are flagged as end items.
There is an API GET /Parts in PTC Product Management Domain which can be used with filter EndItem and Context Name to get End Items of specific product.
