Dear Sumana Kodali,
you have to change
1. Background - there you can delete a line without any issue
2. Single Field - Position Information of each single field which is shown down you deleted lines
3. Window - Change start line and final line by -2 (lines) in table V-T512F
It is a bit of Manual work but it will work.
Link of John Cheriyan will give a complete overview of form editor
BR
Juergen