Go into IN-A and open an item, Sources tab, click on the Vendor Item No. button,
 
Error - WARN ERR - File: t7ina.SRC  Line: 1593 - The function name used was not acceptable:  VLD_SBVEND - (Click OK)
Error -  WARN ERR - File: t7ina.SRC  Line: 1593 - The Field: VLD_SBVEND() was not found.  You may includ only active fields in an expression to be compiled at runtime.   (Click OK)
 
The Vendors Item screen finally comes up.....