Item A = Item B + Item C

Hi,

I am working on cronus database of SP3 indian version.

I have item A . when we mix two items B ,C . Item A can make.

So In item card I created item A.

I created item B. I created Item c.

I done positive adjustment for B, C each qty is 10. Unit cost is 100 for each item.

For item A I done following setup.

Item - Assembly list- Bill of materials.

There I add Item B, Item c.

Now what my query is when I sell Item A through sales order automatically that item B, C has to decrease.

What is the process to get this functionality.

I tried to get what I want , when I select item A in a sales order it is showing message “Item Not available.”

Please put some light to solve this issue.