SAP Note Number: 953823 says string not supported in FM ??

Hello Friends

I am desperately trying to findout how to send a variable length string from XI and save it in a table.

However, SAP Note Number: 953823 says that STRING is not supported in FM but the work around it suggests is as follows:

========================================================

The only work around for this is :

To wrap the Function module used in function control with the custom function module,which substitutes the STRING parameter with CHAR datatype.

========================================================

But the problem is that for CHAR datatype you have to give the field length, the requirement I have is to send a VARIABLE LENGTH data.

Could some one help me in understanding how this can be achieved?

Thanks a lot in advance

Ram