This field on the Main tab of Vendor Maintenance is for EDI users. Select the item number the system should use when transmitting EDI for this vendor.
S = transmit SKU/Alt Part #
M = transmit Mfg #/Spcl
B = transmit SKU/Alt Part#, except when the Keep Stock Info field is set to No, in which case transmit Mfg #/Spcl
Blank = Use the value in the control stream