What is the logic of defaulting Return from and ship addresses in Part Details page? (SR Classic UI)

Summary:

When we create a return for repair or parts exchange the the return from and ship to addresses are defaulting to addresses which are not match the current asset location. Nor, they are primary shipping address associated to customer. Some times, these are blank and don't even default. Could not find any documentation around this. Any help would be much appreciated!!

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