How can we merge multi distribution PO lines to a single distribution?

Summary:

Not able to merge the PO lines having multi distribution. If the other distribution quantity is reduced to zero and one distribution is updated to the entire line amount, still the PO is showing the multi distribution on PO as well as during Invoice creation.
Is there any way to bring back the PO line to 1-1 distribution and let go of the multi distribution by merging them back together (manual or REST API both workaround needed)

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