Hi Michele,
You need to have development for have these fields.
Check the class /SCF/CL_FTR_ASNDLPD_PLUGIN
/SCA/IF_FTR_APPPLUGIN~SELECT_DATA - handles the download
/SCA/IF_FTR_APPPLUGIN~UPDATE_DATA - handles the upload
And also you need to include these fields into FTR structures
/SCA/DM_FTR_ASNDLPD_OUT_STR
/SCA/DM_FTR_ASNDLPD_IN_STR
Regards,
Nikhil