999 line items

Hi all,

In the SD, for One Post Goods Issue Material document and FI document generated.

Accounting document contains two line items.

If the Post Goods Issue contains More than 500items then in FI document generates with more than 1000 line items.

But as per std SAP, Per document 999 line items only.

Client wants to post at a time more than 500 items (DN) Post Goods Issue then more than 1000 line items generated.

How to post morethan 500 items in DN.

Thanks

venu