Hello great people,

Please I have a file (attached). In the file, I have Purchase sheet and Sales sheet of drug items. Everything is working fine as it is except for one feature which I have not been able to wrap my head around.

If for instance on  01/11/2022 I Bought 100 pcs of Item with code number 001 and batch number 21000, and I also purchased 200 pcs of the same item on another date but with batch number 41000 (ALL ENTRIES GOES INTO PURCHASE SHEET). 

Now in the sales sheet, when  I enter the same Item code and I used batch number 21000, and for instance quantity to be sold is 50 out of the 100 purchased, I want a situation whereby if I am making sales at a later day, I should not be able to sell batch number of 41000 until I am done selling qty left for batch number 21000.

Note: All other things are working.

Regards,