Scheduling agreement to delivery document

Dear All,

When I create scheduling agreement and assign schdule line, like

April08, 5 unit

April09, 5 unit

April10, 5 unit

and when i create delivery on April08, 05 unit, system shows the 15 quantity in the delivery document, which is wrong.

Advise the possible solution.

Plus it happen first time in my experience its give a message of " Has No Checking Group (Material Master-Plant Data), we I creating scheduling agreement.

Looking for the prompt response.

Regards,