Binding Collection Error, Field Not Updatable

I've got a 3 tier db app using ADO (a data source class, a data consumer class, and gui) and I keep getting this error.

Binding Collection Error:
Field Not Updatable, Bound Property Name: prpDescription, Field Name: Description

Has anybody seen this before? I've stepped through the code and it's not obvious (to me, anyway) what the problem is.

It's an Access 2000 db and the field is of Memo data type (up to 65535 chars long) but it doesn't seem to matter what the data type is. I've changed to it straight Text, Date, whatever... I keep getting this same error. Even weirder, it brings up all the data from the selected row and will save when changed. I don't understand what's not updatable. It just seems to be a really annoying msgbox.

Seeing as this is my first real attempt at a 3 Tier app and first time using the BindingCollection. I could use some guidance.

"Any help here would be hot."