Why negative stock inventory still can post A/R invoice

Hi,

I don't want to post A/R invoice, when negative stock inventory of the item.

Could anyone find out the solution for me.

Already set the below settings in the SAP:

1)  item master data - inventory data - tick Manage inventory by warehouse

2)  System initialization - Document setting - general - tick block negative inventory by Item stetting

Still I can post the A/R invoice, when no stock ( It's allow negative stock inventory)

Using : SAP B1 ver 9.0 PL 10.

Thanks & Regards,

Siva.