They are definitely lacking the understanding of assigning inventory to a JOB (project).  It appears they think more on the lines of retail and sales and not at all at construction type activity.  I am researching QBO and inventory really is the deciding factor for our company.  We do construction activity, carry inventory for our JOBS, which is held as an asset in Construction in Process until the JOB is complete.  When we use inventory, we release it to our JOB.  Then we can track inventory usage by JOB.  We are not going to invoice ourselves.  This is simple material management in any ERP system.  They just need to add Customer or Project field to the inventory screen and allow the person to choose the correct account, not just inventory adjustment.  I agree, it is a simple fix.