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D365 F&O Record update issue being blocked by Mandatory Field



I have a built a flow to create Stock Count Lines in F&O and in building out the solution I now want to check first if that line exists in F&O, and rather than create, I want to update the existing line. I have completed my List Lookup from the F&O data and I am getting the correct record returned. When I then try and update the record with a new "count" Flow has a mandatory field for the entity being the ItemNumber, but when running the flow it tells you the below:

""message": "An error has occurred. update not allowed for field 'ItemNumber'\r\n"
How do you get around this as it seems like a logic break? Or am I missing something. I am not trying to Update the Item Number but Flow forces me to define it.
Any assistance would be greatly appreciated.Stock Count Update.png

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