welcome to the wonderful world of ZC functions.
you are working on a custom report on the admin side. the undefined function is on the catalog side. some functions are only on 1 side, and not the other; some functions are the same; and some functions with the same name are different on both sides. oy!
you need to figure out which functions from the catalog side you need and somehow only include those.... or some other coding hocus pocus...
this is an issue that will hopefully get resolved in future releases of ZC.
best.
Bookmarks