3554957 - Action buttons are not displayed in My Inbox

• Action buttons (approve, reject, open task, submit,...) are not displayed in My Inbox Fiori application after the task detailes are loaded.
  
  AND
  
  
• RFC call was not successful because of system failure 'Syntax error in program CL_ODATA_CV_ATTACHMENT_API====CP' error is displayed Gateway Error Log (/N/IWFND/ERROR_LOG transaction).
  
  AND
  
  
• The following dump occurred (ST22 transaction):
  

  Category ABAP programming error
  Runntime Errors SYNTAX_ERROR
  ABAP Program CL_ODATA_CV_ATTACHMENT_API====CP
  Application Component CA-DMS

• Task Gateway
• Gateway Business Workflow Enablement
• SAP Business Workflow
• SAP NetWeaver
• SAP Web Application Server for SAP S/4 HANA
• ABAP PLATFORM - Application Server ABAP
• SAP Gateway
• My Inbox Fiori application
• Backend Client SAP S/4HANA 2021 (S4CORE 106 SPS3 or lower releases)

SAP_GWFND, IW_PGW, /IWPGW/TGW, /IWWRK/WORKFLOW, IW_BEP, TASKPROCESSING, SWF_WORKFLOW, LCHR, IF_ODATA_CV_ATTACHMENT_API~DELETE_DRAFT_ATTACHMENTS, ODATA_CV_ATTACH, approve, reject missing, button not displayed, Syntax error in program CL_ODATA_CV_ATTACHMENT_API====CP, /IWBEP/CX_MGW_BOP_RFC_SYSTEM,  /IWFND/CM_MGW004, /IWFND/CX_MGW_TECH_EXCEPTION, CL_ODATA_CV_ATTACHMENT_API, open task , KBA , OPU-BSC-TGW , Task Gateway , CA-DMS , Document management , CA-INB-FIO , Fiori UI for My Inbox Application , OPU-BSE-WFM , Gateway Business Workflow Enablement , Problem