You can validate the ABAP program flow by clicking the Validate button or the Validate All button. When you click the Validate button, the Designer validates the syntax for the selected tab. You can validate each program object separately by using the Validate button.

When you click the Validate All button, the Designer validates all the objects in the program flow. The Designer also validates the placement of all the objects in the program flow.

If you add a new SAP ECC table source to the Application Source Qualifier or remove an existing SAP ECC table source from the Application Source Qualifier, the ABAP program flow rearranges the order of the objects in alphabetical order. You need to update the order of the objects in the ABAP program flow manually.

You cannot use a data type in an ABAP program flow because the data type is an ABAP structure. If you use a data type in an ABAP program flow, the following error occurs:

"<Name>" must be a flat structure. You cannot use internal tables, strings, references, or structures as components