UPDATE which record? Need to know which BookID.
Why use UNBOUND form?
Suggest you review
http://allenbrowne.com/ser-62.html
On the Book Update/Delete form, I want the On Change Event Of the Authors Combo Box to update the BookLibrary TBL field “AuthorsID” when the user selects a new Author
The RecordID is in BookNameCBO Column 1
Might also look at MS Lending Library template database.
Might want to change name of combo from Auth
ersNameCBO to Auth
orsNameCBO.
Advise not to use spaces in naming convention. Better would be BookLibrary_TBL.