Issue in STO

Hi,

When I try to create delivery for STO scenario through VL10D tcode am getting a delivery document created with less quantities compared to the PO quantities.

Say PO has 6000EA but my delivery creates only for 1303EA.In MMBE I checked the available quantities it says 7482EA.I have no clue how the system discounts the quantities to 1330 inspite of sufficient quantities.

Should I check any reserved quantities?....but if any reserved quantities are there then it should reflect in MMBE rite?...I dont see any such reserved quantities.Below is the figures in MMBE

Unrestricted-7482

On order stock-5400

StckTrsptOrderRel-4697

Kindly suggest what is causing this....

Thanks in Advance