Using datatype/element for destination in SAP ABAP

You can use RFCDEST.

RFCDEST statement specifies the destination value for a Remote Function Call connection and gateway information.

Supported Job Types:

This statement are optional for the following job types:

SAP Batch Input Session

SAP Business Warehouse InfoPackage

SAP Business Warehouse Process Chain

SAP Data Archiving

SAP Event Monitor

SAP Job Copy

SAP Process Monitor

SAP R/3

Basic Data
Table  RFCDES  Destination table for Remote Function Call
Field  RFCDEST  Logical Destination (Specified in Function Call)
Position 1
Syntax to be used:

RFCDEST destination

Using Parameter destination
You need to specify the destination for the RFC connection and gateway information for an SAP R/3 system. This destination is the destination that is specified in the connection properties file during installation.
Limits: Up to 20 valid SAP characters and case-sensitive