Part 3: Create Agreement with Supplier
https://drofus.atlassian.net/wiki/spaces/DV/pages/2535555116
https://drofus.atlassian.net/wiki/spaces/DV/pages/2534768653 and https://drofus.atlassian.net/wiki/spaces/DV/pages/2534768905
Adjust Items and Occurrence of Items
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