Longer time for Material Availability check while creation of prd order.

Hi guys,

I am facing a weird problem while creating production orders thru CO01.

I enter the component and plant and I am also using the forward scheduling option.

for some reason, SAP is taking a long time for material availability check when I hit the release button.

Sometimes its taking more than an hour. Its happening with few specific BOM's, and I have checked the master data but I could hardly find a problem in master data.

Can someone suggest me some tips ??

Thanks & Regards,

Sashivardhan