Unicode Issue

How to replace the following code during unicode conversion

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select * into datatab-data from catsdb

where pernr IN select_pernr.

datatab-pernr = datatab-data+3(8).

datatab-tabname = 'CATSDB'.

datatab-dtype = 'C'.

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where CATSDB is transparent table with 108 fields.

and datatab is a structure of type ZHCLONE_DATATAB which has 4 fields PERNR,DTYPE,TABNAME,DATA.

data is a charater field of length 4999.

Error:CATSDB and DATATAB-DATA are not mutually convertable in unicode conversion.

please provide me the solution as soon as possible.

it will be really helpfull for me.

Thanks and Regards,

Santosh Kumar Barik