Solution : https://service.sap.com/sap/support/notes/452273 (SAP Service marketplace login required)
Key words : 
function module /sapapo/confr_ref_to_ext_data, typing /sapapo/matid, typing /sapapo/locid, rules-based atp, source code corrections, note describes corrections, attached notes, release restrictions, related notes, apo required
Related Notes : 
       
| 630948 | MOP scenario composite SAP note | 
| 545202 | PI: Missing delivery customizing for event 01000808 | 
| 453921 | X: char. value, batch no., copy acc. assgnmt to RBATP item | 
| 444569 | Release restrictions for APO 3.10 Support Release 1 | 
| 427957 | Release restrictions for APO 3.0A Support Release 3 |