3729383 - SAP Travel Management: editing a trip raises error message 56821: 'Posting run not yet posted. Trip cannot be changed'

PR05/ WDA application FITE_EXPENSES/ Fiori travel app MTE: editing a trip in status 'transferred to FI' raises error message: 'Posting Run #### not yet posted. trip cannot be changed'  (error message ID 56 821).

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

SAP Travel Management - on premise/ private cloud

PR05, FITE_EXPENSES, Fiori app MTE, error 56821, trip not yet posted, trip cannot be changed, transferred to FI, posting run, docs created, financial accounting, FI posting, trip costs, posting run status,  , KBA , FI-TV-COS , Trip Costs , FI-FIO-TV-MTE , My Travel and Expenses , Problem