Performs a full update (replacement) of a position. All fields in the request body will replace the current values.

Business Rules:

• Role (externalCodeRole) is required and must exist

• Area (externalCodeArea) is required and must exist

• Parent position is optional - can be null for root position

• Employee assignment is optional (can be null to unassign)

• Employee can only be assigned to one position at a time

• Operation Unit (externalCodeOperationUnit) is optional (can be null to unassign)

• Set nullable fields to null to remove them

Additional Leaders (additionalParents):

• When provided, completely replaces existing additional leaders

• An empty array removes all additional leaders

• If not provided, existing additional leaders are preserved

• Maximum of 5 additional leaders allowed

• All additional leader positions must exist

• Cannot reference itself or main parent as additional leader

• No duplicate codes allowed in the list