Hi SaXx, thanks for the new link, it worked fine. As to your form, I see why the multiple-selection listbox is giving you trouble. The listbox treats different entries with the same value as the same, so clicking "Photo on Video," which has a value of 300, also turns on all the other listbox entries with a value of 300. There are several things you could do, but here's your best option:
1. Change the listbox back to text (I know I told you to make it integer, I apologize).
2. Then change its values to strings like "photovideo" or "weddingcredits."
3. Then use a button to set your total field, and add rules like this:
IF any occurence of LISTBOX =
"Photo On Video" THEN total = total + 300.
And so on for all the values of the listbox.
To use "any occurence of" in rules, change the selection in the drop-down listbox in the Field Selector to "Any Occurence of TOTAL" (the name of your field that stores the TOTAL value.)
You'll be able to keep all your other fields as Integer data types. If you need me to, I'll see if I can get your form to you with the changes to the list box.
Have a great day!