Update External Bank Branch API

I am trying to use the IBY_EXT_BANKACCT_PUB.UPDATE_EXT_BANK_BRANCH API in version 12.2.7, database 12C.  I have the following variables:

p_ext_bank_branch_rec          iby_ext_bankacct_pub.ExtBankBranch_rec_type;

   p1_api_version                 NUMBER             := 1.0;

  p1_init_msg_list               VARCHAR2(200)        := 'F';

   x1_return_status               VARCHAR2(1);

   x1_msg_count                   NUMBER;

   x1_msg_data                    VARCHAR2(1000);

     x1_response                    iby_fndcpt_common_pub.result_rec_type;

Here's the API:

iby_ext_bankacct_pub.update_ext_bank_branch (p1_api_version            => p1_api_version,

                                                                p1_init_msg_list          => FND_API.G_TRUE,

                                                                p_ext_bank_branch_rec     => p_ext_bank_branch_rec,