Create Business Partners with LSMW and IDOC

Hello Group:

        I am working on SAP Banking, I need to create Business Partners using LSMW and IDOC (which I have no experience).

        I created a LSMW based on the IDOC BUPAFS_FS_CREATE_FRM_DATA2 (Message) / BUPAFS_FS_CREATE_FRM_DATA201 (Basic Type), this is Working. I checked that the Business Partner is created with the BP transaction.

        The problem is that the structures of this IDOC only have the basic fields, missing many others that appear when creating a BUPA by the BP transaction.

        I found another IDOC, BUPA_INBOUND_MAIN_SAVE_M (Message) / BUPA_INBOUND_MAIN_SAVE_M03 (Type Base), that has all the fields required to register for each Business Partner.

        I created a LSMW using it, after a few mistakes, now Ends Everything Ok, the IDOC resulting in green, but NOT Nothing is Created.

        I am sure something is missing.

        Why would someone please help me?

                           Greetings, Thanks to All, Hernán

PS: It must be LSMW + IDOC for the amount to upload (1,000,000).