deep structures in infoset

Hi

I have developed a infoset in the standard area of GRC system using the transaction SQ02.

In the InfoSet some tables have fields which are deep structures.

when i include a field where the data type is string and which is a deep structure i`m getting an error

"deep structure(strings and Xstrings) are not allowed in infoset" while generating the infoset.

I need those fields in my infoset .

How should i go forward and generate the infoset please guide me..

Thanks

Kalai