====== Previews ======
Sometimes cinema take a film print to show it in cinema in preview mode before the release date of the film. 
Well. Before all money and attendance were entered into first week box office data. But now we have an ability to add these data into special flat record called preview flat record. 

Let's go to see differences and how the FDM will calculate data for this. 

===== Flat sale form =====
First of all -- enter new record into the [[flat_sale]] form.
 
You should specify the realease date of the film in the field "Date from". This needed because some FDM reports ignores the release date from the estimates table. 

Ok, in the field "Preview date" -- you can specify the date of the preview. It's not used now, may be will be used later. 

Other fields: 
"Preview" checkbox should be signed \\ 
"Attendance" -- should have non-zero value. 

Preview's gbo should be entered into the field "Amount, US$". \\ 
**Note** that amount should be in **USD**, this is one of flat's constraints. Don't forget about this. 

===== Edit Flat form =====
The same rules as for flat sale form.

===== DGBOS report =====
This report uses all previews records as a source for 'Preview GBO' and 'Preview attendance'. 

===== OWE report =====
It takes preview gbo into first date of film release in the cinema where these preview was entered. 

Therefore it don't show preview in flat records.

===== Film Box Office report =====
This working on updated DGBOS engine. 

It shows previews as usual flat records. But attendance is not equal to gbo / 4.5, but preview's atendance. 

===== Cinema Box Office report =====
This working on updated DGBOS engine. All calculations inside. 

===== Studio Box Office report =====
This working on updated DGBOS engine. All calculations inside.