The Override Unique APRef Level field on the AP Vendors form, Add'l Info tab.

Specify how validation for duplicate AP Reference numbers (entered in AP Transaction Entry, AP Unapproved Invoice Entry) will be handled for this vendor. Validation levels set here override the validation level defined for the company (AP Company Parameters).

• 0-No Override – Do not override validation option specified for the company in AP Company Parameters.

  Note: If you have set the company validation level to 'Master Vendor/Co' or 'Master/Vendor X-Co', and this vendor is not set up as a master vendor or sub vendor, the validation process will assume this vendor as its own master vendor and include it when checking for duplicate numbers
• 1-By Vendor & Co – Check for duplicate reference numbers for vendor within the current company. If a duplicate number is entered for this vendor in the current company, display a warning and only allow entry if the "Prevent Duplicate AP Reference" option (AP Company Parameters) is N (unchecked).
• 2-By Vendor X-Co – Check for duplicate reference numbers for vendor across companies. If a duplicate number is entered for this vendor in any company sharing this vendor's vendor group, display a warning and only allow entry if the "Prevent Duplicate AP Reference" option (AP Company Parameters) is N (unchecked).
• 3-By Master Vendor & Co – Check for duplicate numbers for master vendor/sub vendor and company. If this vendor is a master or sub vendor, and a reference number is entered that already exists for this vendor or any vendor in the master/sub vendor group in the current company, display a warning and only allow entry if the "Prevent Duplicate AP Reference" option (AP Company Parameters) is N (unchecked).
  Note: This option is only applicable if you are using master vendors and sub vendors.
• 4-By Master Vendor X-Co – Check for duplicate numbers for master vendor/sub vendor and company. If this vendor is a master or sub vendor, and a reference number is entered that already exists for this vendor or any vendor in the master/sub vendor group in any company sharing this vendor's vendor group, display a warning and only allow entry if the "Prevent Duplicate AP Reference" option (AP Company Parameters) is N (unchecked).
  Note: This option is only applicable if you are using master vendors and sub vendors.