Hi Pratyaksh,
I Understand from above that the special character you are mentioning is not '#" as shown.
It is different from #. If yo ask your technical team and debug, you will find it having a special ASCII generated for " Enter Key" .
You explain this to your ABAP guys that this Enter in Text is generating a special character and this needs to be changes to ' ' ( space ).
To solve this you have to put a Routine to replace this special Key .
I had similar issue long time back and my ABAP consultant solved it.
Hope it helps,
Regards,
Sudhir.