MDG 7 - CL_FPM_FORM_UIBB_ASSIST_GL2->MV_EDIT_MODE suddenly becomes 'R' during pop-up window event FPM_OPEN_DIALOG

Hello experts,

I'm a novice ABAPer and have little or no experience in webdynpro. There is a custom pop-up window with radio-buttons at some screen during customer creation in our MDG 7 system. During creation I have no problems but during change mode, the pop-up window's edit mode suddenly becomes 'R' (read-only) during the event FPM_DIALOG_OPEN. During creation, the edit mode is at constant 'E' (edit mode). When the edit mode is at 'R', the radio buttons are disabled. If I force debug CL_FPM_FORM_UIBB_ASSIST_GL2->MV_EDIT_MODE to "E", the radio buttons are enabled.

Any ideas on what to do with this issue?

Thanks in advanced,

Jack Rockefeller