FK02...HELP

Experts!!

Experts help me..Im using fk02 and Im currently doing a bdc.

Scenario::

In the communication section I need to record telephone and mobile number.They do have different window respectively. But both of them (telephone and mobile number) are using one table which is adr2 and also they shared one field 'Tel_num.'

Both the records of mobile and telephone number are being stored in field tel_num.

Question is:

Is there a way for me to separate or distinguish of what value of which field.

I need to know what are the values w/c belongs to telephone number only and which values are belong to mobile number only..

Please help me masters!!

Points will be rewarded..