Error While saving BP

HI Expert ,

I am getting error while saving the BP .

Step involved :

Step 1: I open BP Tcode

Step 2 : i click on person

Step 3 : I entered title , name , Last name . city , email , PO , country

Step 4: I press save button

Then I get Error/exception

here is Exception

I check that null value is assign in Fields symbol

Thereafter I debug the code and found that this code is associated to class : FSBP_CNS_TYPE_HANDLER_FSBPP and its method IF_XO_CNS_TYPE_HANDLER~NEW_CHANGE_POINTER

In debug mode i found that (line 37) i_bo_reference doesnt have mo_bpca object and thus due to its return nul value in lt_table_data (line 41)

due ti this (line 48) nul value is pased to fields symbol <table_data>  .

Can any one please help me .

thanks,

rishi