Hello,
I had migrated back from Firebird 3 Beta to Firebird 2.5.  Later during migration from Firebird 2.5 to 3
I got violation of PRIMARY or UNIQUE KEY constraint "RDB$INDEX_2" on table "RDB$FIELDS" 
for SEC$USER_NAME and  SEC$NAME_PART

Hence renamed RDB$FIELD_NAME field values in the system table RDB$FIELDS of the source database as under:
'SEC$USER_NAME' to 'SEC$USER_NAME_RAJIV'
'SEC$NAME_PART' to 'SEC$NAME_PART_RAJIV'

Now I cannot delete 'SEC$USER_NAME_RAJIV' and 'SEC$NAME_PART_RAJIV'
Can I safely ignore this?
If no, how do I correct this.

Thanks and Regards,
Rajiv