When I go into the A/P module, and into an existing customer, if I click on the magnifying glass on the field for Account Set, I get a message pop up that says: "Account Set has changed. All postings for this vendor will use the new account set. Do you want to change the account set?" It makes it sound like I have already made a change, when I am simply looking at this field. Or have I changed something at this point?

Hi Barb,

Simply accessing the finder on the Control Account Set within editing an AP Vendor or an AR Customer will not give this message. Only if you change the existing value to something different will you get a change.

So indeed you had selected something different.

If the vendor/customer has an outstanding balance, you would have got a different message - something to the effect of you can't make that change when there are outstanding transactions.