Delivary Problem

Dear all
SO is for 3 quantity.2 already delivered,invoiced.
While doing delivary VL01N for the remaing one,system is showing error like zero stock available despite stock availability in concerned storage location.
1.In MMBE it is showing stock is 4 and under that line
SPIC4 -when i double click on this, it is showing
UR stock 4      and    schedule for del 4 
2.when i go for CO06, It is showing two delivaries against which this 4 number available stock is confirmed for the dates like 22.07.2005 and 13.01.2006
3.For those deliveries, proforma invoices created.
4.Now even if i want to cancell these invoices/deliveries system is not allowing , indicating you can't cancel proforma invoice and in case of delevary,no suitable data available.
5.I want to deliver 1 quantity, how to solve this problem?

I go by your comments  [UR stock 4 and schedule for del 4]
please check in VL21 or VL06 since a delivery has already been created for 4 nos. and saved but not PGId.  You have to delete that document.  Then only, you can do PGI for the remaining 1 no.
thanks
G. Lakshmipathi

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