Fiori Approve requisition (Header) can't fetch item data

Hi,

I am trying to implement approve requisition (approval by header level).

I can see the number of PR I need to approve in the tile,

But when I click, it is HTTP error, and there is dump at the backend (CL_GBAPP_APV_PR_API)

this is because the item number is 00000.

system is new, notes are implemented.

any idea?