Unable to select product in PO section after 7019 applied

Unable to select product in PO section after 7019 applied

We have just applied 7019 to SD (was 7018) and now in the PO section when we select a vendor (ie. Dell) we are not shown any associated products and there are non in the drop down selections. Please advise as this make the PO section non-functional..

Enclosed is the error we get when in the PO module

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