In order to delete unused custom field for Items they need to be removed from Invoice and SO transactions. If I export SOs and Invs I see all instances of their use have a FALSE in them (the default).
Deleting all the values and re importing does not work because Z Books will not overwrite existing invoices, will only add new invoices which makes sense for safety.
How can I get rid of the data in the unused custom fields so they may be deleted? I have reached my maximum permitted custom fields because of deactivating unused fields and creating new ones.
Greg Aanes
2109 Queen Street
Bellingham WA USA