1st, for Mohammad, copy control of text is not done in SPRO-> copy control. It is done in Text determination procedure. Need to maintain transfer = A or B and access sequence = 03.
2nd, for Madhu, can you talk about where this unique text is from? It is possible to display "default" text. Technically, text type can be determined automatically or entered manually. What I understand it that you want your text type to automatically determine a unique text when creating Task that is followed up from preceding Interaction Record. To auto determine text for a text type, you need to decide what resource of the text. Then maintain proper access sequence to retrieve the text from this resource. You may use standard access sequence or write your own func module (assigned to the access sequence) to retrieve the text. This is why I asked you where the unique text is from. We may then be able to help find proper customizing for access sequence for you.
Spencer