Solution : https://service.sap.com/sap/support/notes/166961 (SAP Service marketplace login required)
Key words : 
target applications ps/pm/cs, run correction report zcatspm2/zcatsps2, check transactions iw46/cn30 regularly, additional key words cat5, longer display error lr121, empty bapi/error record, generate error message lr121, transactions iw46/cn30, 'check confirmations' icon, correction instruction contained
Related Notes : 
       
| 1246420 | Composite SAP Note : Cross Application Time Sheet Docum. | 
| 96505 | CATS: Error when creating an error log |