Short dump DYNPRO_MSG_IN_HELP when choosing Sender field in GCF1.

Hi,

I got to tcode GCF1.I have specified the receiver and sender tables.the receiver field and sender table are filled by F4. When I try to select the field for Sender Field by F4 I run into a short dump DYNPRO_MSG_IN_HELP.

Please provide some inputs how to solve the issue and proceed further.

Regards,

Joy