How override Manager while hiring if we are using Position Hierarchy

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Good day, 

We are using Position Hierarchy functionality in Oracle HCM Cloud. So,  while we are hiring an Employee and select a position in assignment, Line Manager field is automatically filled with incumbent from parent position as required. But the problem is that in some cases we need to change the information about Line Manager but it is not possible as the value is not editable (please see the screenshot). 

Probably there are some ways how we can override Line Manager?

Thank you!