Safty stock level

HI Gurus ,

I was just wondering if I I could get any assistance from you for following ,

I have the following scenario that i have a question for.

Safety stock is set at 140 units

Actual stock is at 150 units

An order was placed for 20 units. As the stock would fall below 140, the

order is not able to be picked (10 would u2013 but not the last 10)

MD03 is run and a purchase requisition is flagged for 600 units. The

requisition is confirmed to a PO.

Why then, can i not deliver the order that will take the stock below the

safety stock level? Even though there is an order taking the stock above

the safety stock level?

Many thanks in advance!!