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SPCascadeDropdowns fails on some lists that have required lookup columns


On a site collection I have a list title "Territory" and another list titled "Products" (the relationship list). I then have 8 different lists, each has a "Territory" and "Products" lookup column with the Cascading Dropdowns. The Products drop down will depend on the Territory selected.

SPCascadeDropdowns is working on all but 2 of my lists. On these two lists I can only get it to work if the two columns are not listed as required. Problem is I need them to be required. It works well on the other 6 lists.

Not sure what the difference is that is causing this issue on only two lists.