overflow error while loading from flat file to PSA

Hello,

i have created one generic data source to upload the data from flat file. In the data source, i have defined the following field

Tquantity  of data type : QUAN ,length = 7 and decimals = 2, external length = 9 and format = Internal.

However, when i am loading record with quantity = '261450' , the system is throwing up the error " overflow converting from '261450' when assigning application structure'.

Any idea why the system is throwing up this record, even the length of the value passed is only 6 digits.

Regds,

BW small