SO is not appearing in MD04

Hi SD gurus,

We have an interesting issue. While creating the sales order for a material we are not able to see the SO in the MD04 transaction, when the fixed date and qty field is checked and the SO is appearing in MD04 if the same field is unchecked in Schedule line tab.

Please let me know how we can get the sales order in MD04 transaction with the field fixed date and qty checked in the SO

Thanks for your help in advance.