Solution : https://service.sap.com/sap/support/notes/1390151 (SAP Service marketplace login required)
Key words : 
performace lag/delay, bo mapper refresh, attached correction instructions, /sapsrm/if_cll_dodm_account~handle_lead_select, multiple accounting lines, lead selection reason, lead selection, accounting lines, terms handle_lead_select, /sapsrm/cl_ch_wd_dodm_acc
Related Notes : 
       
| 1457285 | FAQ: Accounting PO Transfer, FI/MM Validation Errors | 
| 1266771 | SRM 7.0 Performance Guide |