BADI Implementation

i am new for the BADI

I have created a implementation for the BADI HRRCF00_GET_EXT_CODE by name ZHRRCF00_GET_EXT_CODE .

This badi is already having one standard implementation by name HRRCF00_GET_EXT_CODE which is also active .

so , please tell me when this badi will execute which implementation will execute . DO i need to deactivate the standard Badi implementation to execute our badi implementation .