Solution : https://service.sap.com/sap/support/notes/402363 (SAP Service marketplace login required)
Key words :
symptom bapi function modules bapi_incominginvoice_create, online transaction miro, additional key words, system checks, item level, item amount, table t_itemdata, field item_amount, error message, check results
Related Notes :
453646 | BAPIs: No direct posting to G/L account/material |