Solution : https://service.sap.com/sap/support/notes/1061698 (SAP Service marketplace login required)
Key words : 
sapapo/dm_po_op_da2 badi, parameter iv_plifz_not_constraint = 'x'', supply network programming, planned delivery time, program error, solution implement, note 722227, prerequisites, corrections
Related Notes : 
       
| 722227 | BAdI: Ignore planned delivery time |