I am getting the following error when I try to merge a supplier into another with copying the site

Log File

BINARY

Enter Password: 
MSG-03000: Start Before Reports Trigger.
MSG-03010: After SRWINIT
MSG-03011: Checking whether from vendor id and vendor site id are passed or not
MSG-03016: Checking if there are any invoices selected by PPR
MSG-03017: P_DUP_VENDOR_ID=1561077P_DUP_VENDOR_SITE_ID=1542248
MSG-03018: l_ppr_sel_inv_count=0
MSG-03020: Check CHV installation status.
MSG-03030: Check MRP installation status.
MSG-03040: CHV status: Y and MRP status: Y
MSG-03050: Call function get_company_name
MSG-03070: Call function GET_NLS_STRINGS
MSG-03090: Call function get_base_curr_data
MSG-03110: Call function custom_init
MSG-03120: Checking for duplicate tax sites.
MSG-06010: Begin function DUPLICATE_TAX_SITES.
MSG-06020: Inside For c1 loop begin.
MSG-06030: After fetching l_dup_tax_flag, l_dup_inactive_date...
MSG-06040: Inside If l_dup_tax_flag...
MSG-06050: Count of Y tax_reporting_site_flag: 0
MSG-06070: End function DUPLICATE_TAX_SITES.
MSG-03040: Call function duplicate_sites.
MSG-07000: Begin function duplicate_sites
MSG-07010: l_party_site_id value:
MSG-07020: Begin duplicate vendor sites