CMD_EI_API with ICMSTAXPAY

Hi,

I need to create a customer without customer number reference and I discover this CMD_EI_API to help me with that.

Everything was great until I had to populate this field call KNA1-ICMSTAXPAY (ICMS Taxpayer), because it's not in the structures that CMD_EI_API use or at least I think it's not, because I search and couldn't find.

How can I create a customer populating this ICMSTAXPAY field ?