Reg: Field value updation in the database table

Hi All,

can anyone please guide me in this issue.

My requirement is to uploading the Excel data into sap, in that excel one field contains around 400 characters.

When i am uploading the excel file into sap database table, it takes upto 255 characters.

so i changed the datatype to string and tried again, now this time it throws an error as mentioned below.

"ZBOQ" must be a flat structure. You cannot use internal tables,

strings, references, or structures as components. .

Thanks in Advance,

Ramesh.