999 line items issue

Hi All,

As per stand sap we can post only 999 line items. but my client uploading file more than 999 line items , so showing error msg...

so now we need do solve this issue.

Requirement:

when business uploading the more than 999 line items file , system automatically  after 999 line items split and generate the second document . ..

can any one tell me the logic of this .

Regards,

O.Srilatha