In an FTP job (FTP_GET/FTP_PUT) you can create a variable for almost all parameters:
It is however not possible to create variables for:
Release : 6.x, 7.x
Component : Dollar Universe Application Server
DE165869
Use a Uproc of type CL_INT and call the command 'uxstr FTP'. This way you can use variables for all different input parameters.
Update to a fix version listed below or a newer version if available.
NOTE: The fact that the User cannot be used in a variable is subject of a Request for Enhancement, this might be added in a future version.
The reference for the RFE is: DE165869