Plugin Issue onto Work Order Product Entity

Hey,

I am trying to create one Work Order Product (same product) for multiple work orders in Field Service Module, I am having a error as below. Can anyone help me with 

Error - "There can't be two active records for the same warehouse, product, and unit."

1. What makes a work order product unique ?

2. The below are the 3 OOTB  plugins causing this issue 

Field Service: Create (post-operation) for msdyn_workorderproduct]

Field Service: Create (post-operation) for msdyn_inventoryjournal]

Field Service: Update (pre-operation) for msdyn_productinventory]