Notes on Changing the Integration Scenarios 
You should not make the following changes in Customizing during production operations, because these changes could result in a change of the integration
status and subsequently require extensive matching activities.You change the integration date for scenario 2 or scenario 3 so that,
you change the control of the integration to HR Funds and Position Management (scenario 3) so that

The system issues a warning message as soon as the participation of an employee changes in the scenario, the properties of the employee are changed, or if the settings in Customizing change.
Procedure
You must adjust the infotypes 0001, 0027, and if required 0014, 0015, 2001-
2005 and 2010 for the employee in question. The adjustment must be done manually because the system does not automatically match the data.You can determine the employees affected, for example, using an ad hoc query. You then need to split the infotypes 0001 and if required 0027 of this employee - 2 records must be created for these infotypes - and subsequently check the field content of the funds center and fund.
If you have made changes for which the HR Funds and Position Management integration is active, you must also change the financing of the employee. (
For example, must the financing begin earlier or later.)