Solution : https://service.sap.com/sap/support/notes/40357 (SAP Service marketplace login required)
Key words : 
additional key words oit2 v_tai02 tai02 sapl0im3 capital investment program, capital investment program positions, entered edit mask, allowed special characters, create edit masks, edit masks, correctly definedalthough, rule applies, characters '0', errorap024
Related Notes : 
       
| 398983 | Information: IM (Investment Management) | 
| 48103 | IM: Error AP130/AP131 when deleting edit screen | 
| 48064 | Cap.invstmt progs:edit screen cannot be deleted | 
| 43723 | Unjustified AP019: length of entry is not correct | 
| 39321 | Capital inv. prog.: Runtime error or EAP019/20/21/22 | 
| 39311 | IM: Runtime error when maintaining edit screens | 
| 26393 | IM: Maintaining coding masks not possible OR ... |