Error AP_VENDOR_PUB_PKG.Create_Vendor_Site on EXCLUSIVE_PAYMENT_FLAG

I am writing a script to create supplier sites using AP_VENDOR_PUB_PKG.Create_Vendor_Site. I set the site record with:

l_vendor_site_rec AP_VENDOR_PUB_PKG.r_vendor_site_rec_type;

When I try to set:

l_vendor_site_rec.EXCLUSIVE_PAYMENT_FLAG := 'Y'

I receive an error message that it must be declared. 'EXCLUSIVE_PAYMENT_FLAG' is a column in ap_supplier_sites_all. Can it be set when creating a supplier site?

Thanks,

Nancy