Solution : https://service.sap.com/sap/support/notes/373712 (SAP Service marketplace login required)
Summary : 
      This SAP Note addresses a specific issue where the "Change Schedule" button and menu item in the Shipment Cost Worklist (O4L6) are non-functional for shipments with status 5 or 6 in IS-OIL / IS-MINE environments. The recommended solution includes applying CRT SAPKI46H18 for IS-Oil version 4.6B, or in urgent situations, importing Transport SOFK003704 manually. The transport is accessible on SAPSERVx servers under specific directories. It is crucial to ensure this note is applied only to systems with the appropriate IS modules installed to avoid potential system damage. Prior to installation, references to SAPnet Notes 312430, 312435, and 312371 are advised for proper sequence.
Key words : 
~ftp/specific/isoil/46b/notes/note, additional key words o4l6, -mine-specific note, gui status frcost, apply crt sapki46h18, important supplementary information, shipment cost worklist, import transport sofk003704, sapnet notes 312430, note 13719 describes
Related Notes : 
       
| 382197 | IS-OIL / IS-MINE: CRTs 18-24 for SAP_APPL Support Packages | 
| 312435 | Order of IS-OIL / IS-MINE 4.6B Notes (SAP_ABA) | 
| 312430 | |
| 312371 | Order of IS-OIL / IS-MINE 4.6B Notes (SAP_BASIS) | 
| 47531 | IS-OIL / IS-MINE / IS-CWM correction guideline | 
| 13719 | Preliminary transports to customers (note for customers) |