You may suspect that setting up a domain name in the field catalog will make some effect on the display, for example in data type, length, lowercase sign,  but it seems that it has no effect in ALV grid. Maybe just for information and for Report-Report interface, where this field is use as one of the matching criteria for selection-screen parameters.

As you can see on the next image, although I gave the DOMNAME value FLAG, it didn’t changed anything in the field catalog.

Figure 108 DOMNAME in Field catalog

Before writing this part, I was never using Report-Report Interface, so probably it is not common scenario to do so, or it is not used with the systems I had possibility to use. But anyway I’ve made a deep dive into topic, to understand how we can use this interface and for which purpose.  

Seems that, using this interface, you can call from ALV grid an BW Query, SAP Query, ABAP Report Program or Transaction. Probably depending on the installed version of your system, or addons, the list of the interfaces may be longer.

Anyway I’ve focused here on a simple example of calling another ABAP report using RRI. At the beginning I was wondering if configuration in table TRSTI and setting the parameter REPREP to ABAP_TRUE will be enough to call the interface. So I’ve started with filling TRSTI, where I’ve set sender and receiver, both as RT (ABAP Report Program).

Figure 100 TRSTI entry for sender program

This field allows us to set (or change) the header text of the column. It can consist up to 55 characters in lowercase mode. When you use data dictionary reference ( REF_FIELD, REF_TABLE ) it is populated automatically from the data element of the referenced field.

Figure 97 Texts of Data Element S_FROMAIRP

The changes of this parameter are only visible in edit mode and makes sense only for character or string fields. If it is set to ABAP_TRUE (‘X’), then the ALV grid stores in internal table the value in lowercase, if the value of the parameter is empty, then it will always convert the entered value to uppercase.

Figure 96 Results of zdemo_ain_cl39 with lowercase turned on