cannot get AP invoice to enter correct accounts

[Walter Sams]

I have installed gnucash 2.4.2 on unity linux to see if it will handle our theaters accounting
We need to be able to track costs and income by shows (  ie    job costing )

I have set a customer to       Cust
I have created a job for the customer   play1
I have vendors entered                        vend1
I have a vendor job entered                 play1   ( I set the same name for the customer and vendor jobs )

When I enter an invoice from vend1    and enter the job information  the program then opens up the register
this is where I should enter   date, inv #,  description, type ( material or labor),  expense account,  amount  etc

the problem is that where I am expecting    Expense Account  entry    gnucash is only letting me enter income accounts from the dropdown list

I checked in the tutitorial and it said that I should be entering expense accounts   ( as I was expecting)   

Can someone help me understand what is going on?

I don't want to start up the great debate on how job costing should be done here,  I just want to know how can I use gnucash to accomplish my task

I must be able to print reports that show   that for play1    I took in $x.xx  in ticket sales   and spent  $x.xx  in programs, costumes, props, etc.....
and since we do  more than one show per year  I dont want to create a complete chart of accounts for each play


your help is appreciated


Walter