You should inputreal cost object like pa segment or internal order with revenue with cost center for cost element with element category 11.
If then, Cost center have statistical amount and PA segment or internal order with revenue have real amount at the same time.
SAP Help description:
If you post revenues to cost centers, the values appear as statistical information only. This means that you can repost revenues for posting adjustments to other cost centers, but another allocation is not possible. Revenues are ignored in iterative activity price calculation and are therefore not included in the allocation price of an activity type.