Telephone Number not changing in BP BAPI_BUPA_ADDRESS_CHANGE

HI All,

I have 1 issue , When i enter telephone NO, FAX while creating BP using FM BAPI_BUPA_ADDRESS_ADD It is adding, that we can also change using BAPI_BUPA_ADDRESS_CHANGE.

But If i don't enter Telephone Number , fax in BAPI_BUPA_ADDRESS_ADD,

I am not able to change using BAPI_BUPA_ADDRESS_CHANGE.

Thanks in advance

Hemalatha