We need to have different Ordering Units of measure based on the site for same article/same vendor. There are multiple reasons for this need. The PIR seems to only allow one primary Unit of measure. I had read somewhere that setting up a different purchasing organization would allow the different Units of Mearsure, however in testing this it did not work. Any change to the article/vendor at one purchasing organization updated the other purchasing organization. I know that a PO could be created with changing the Unit of measure manually, however we need to use replenishment functionality due to the # of articles and the frequency of articles ordered.
We have 100s of articles across 90+ sites.