The Allocation Sources tab is used to define the source of costs when you need to allocate the cost of services provided to the entity and related to construction.These costs are recorded to the WorkInProgress account with items of the Service type as Cost Element.
The tab comprises the following three panes:

• Departments for Allocation: Here you can set that date range for selecting the costs and select the departments involved.
• Expense Items for Allocation: In this pane, you can create a list of expense items which costs you need to allocate.
• Cost Elements for Allocation: Use this pane to specify the costs elements.

The WIP Allocation by Cost Object (create) form. The Allocation Sources tab
Use the Analyse Data from and To fields to define the period in which the costs incurred.

The Departments for Allocation pane

Click Add to add a row to the table.
In the Department column, select a department whose costs should be allocated.

The Expense Items for Allocation pane

Click Add to add a row to the table.
In the Expense Item column, select an expense item to allocate the costs recorded to this expense item.

The Cost Elements for Allocation pane

Click Add to add a row to the table.
In the Cost Elements column, select a cost element which is a Service and whose costs should be allocated.