UDF checkbox not working properly?

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Hello all,

I have created a checkbox UDF in PO_PurchaseOrderHeader.  However, sometimes my users check the box, then press "Accept" to save, only to find that it is not saved.  They have to go back and do try to check it several times (sometimes up to 5-6 times) when it finally decides to save?  This is a huge problem, because everytime we enter a PO, we need to go back and check if this checkbox saved properly, which is causing a lot of additional work (and errors when the users don't catch this).  Can anyone let me know if there is a solution to this issue?  Thank you.

Richard