Problem: you want to disable error messages caused by incorrect Item Type in CRM document.

Solution: first of all you should check configuration. This kind of errors are likely caused by incorrect configuration or configuration mismatch between CRM and ERP.

If configuration is fine, error persists and you want to get rid of it, you can modify standard SAP code in include LCRM_ORDERADM_I_OWF17.

The solution is to send IV_MESSAGES = FALSE in PERFORM determine_item_type. This will disable system from adding error messages even if the Item Type causes one.