Document flow Navigation issue

Hello all,

We have possibility to navigate thorugh Service ORder, Order to Confimration, confirmation to order Etc.

Problem is when Service Order 123 has Item A and Item B, Follow up document 456 has Item B.

We switch from contract 123 to 456, it shows the follow up document 456.

when you comeback to source document by using BACK button Item B temporarily disappears from contract.

If you reopen again, everything is there.

I guess its  SAP Bug. Does anyone know if there is a note to fix the issue pelase?

BR,

KP.