Or you may customize your request_status_change.htmpl form like;
<PDM_IF "$args.customer" == "$cst.id">
<PDM_MACRO name=dtlDropdown hdr="Status" attr=status default="!default_trans_sym!" evt="onBlur=\\\"detailSyncEditForms(this)\\\" factory=crs_cr initial="!default_trans_code!" lookup=no>
<PDM_ELIF "$args.assignee" == "$cst.id">
<PDM_MACRO name=dtlDropdown hdr="Status" attr=status default="!default_trans_sym!" evt="onBlur=\\\"detailSyncEditForms(this)\\\" factory=crs_cr initial="!default_trans_code!" lookup=no whereclause="(code != 'HOLD')">
</PDM_IF>
Regards,
Turker