Newbie question: ListAggregate management.

[lucagervasi]

It's a newbie request, i know...
I searched the Discussions (not a huge number...) and read the documentation, searched the internet (not much there too..) but was unable to understand how a ListAggregate should work...

I'm trying to respond to an account request, currently I think that a request like this (gnucash)

  <SIGNUPMSGSRQV1>
    <ACCTINFOTRNRQ>
      <TRNUID>08A04E28-35DE-4A09-8366-EA6A92A21FF8
      <ACCTINFORQ>
        <DTACCTUP>19900101
      </ACCTINFORQ>
    </ACCTINFOTRNRQ>
  </SIGNUPMSGSRQV1>

should get a response like this:

<ACCTINFOTRNRS>
  <TRNUID>08A04E28-35DE-4A09-8366-EA6A92A21FF8</TRNUID>
  <STATUS>
    <CODE>0</CODE>
    <SEVERITY>INFO</SEVERITY>
  </STATUS>
  <ACCTINFORS>
    <DTACCTUP>20050301</DTACCTUP>
    <ACCTINFO>
      <DESC>Power Checking</DESC>
      <BANKACCTINFO>
        <BANKACCTFROM>
          <BANKID>123456789</BANKID>
          <ACCTID>00001234</ACCTID>
          <ACCTTYPE>CHECKING</ACCTTYPE>
        </BANKACCTFROM>
        <SUPTXDL>Y</SUPTXDL>
        <XFERSRC>Y</XFERSRC>
        <XFERDEST>Y</XFERDEST>
        <SVCSTATUS>ACTIVE</SVCSTATUS>
      </BANKACCTINFO>
    </ACCTINFO>

    <ACCTINFO>
      <DESC>Power Checking</DESC>
      <BANKACCTINFO>
        <BANKACCTFROM>
          <BANKID>123456789</BANKID>
          <ACCTID>00001234</ACCTID>
          <ACCTTYPE>CHECKING</ACCTTYPE>
        </BANKACCTFROM>
        <SUPTXDL>Y</SUPTXDL>
        <XFERSRC>Y</XFERSRC>
        <XFERDEST>Y</XFERDEST>
        <SVCSTATUS>ACTIVE</SVCSTATUS>
      </BANKACCTINFO>
    </ACCTINFO>


  </ACCTINFORS>
</ACCTINFOTRNRS>

where I have multiple occurencies of ACCTINFO with BANKACCTINFO and CCACCTINFO.
I have a backend with some account informations and I'm iterating it like this:

accounts = TransactionAccount.query.filter_by(idRefUser=u).all()
  current_app.logger.info(f'Accounts: {accounts}')

  banks = []
  creditcards = []
  
  for a in accounts:
    current_app.logger.info(f' - Account: {a.accountNumber}')
    if a.accountType.upper() == 'CHECKING':
      try:

        bankacctfrom=BANKACCTFROM(
                bankid = a.bankid,
                branchid = a.branchid,
                acctid = a.accountNumber,
                accttype = 'CHECKING',
                acctkey = a.acctkey
              )
        current_app.logger.debug(f'bankacctfrom: {bankacctfrom}')

        bankacctinfo=BANKACCTINFO(
              bankacctfrom=bankacctfrom,
              suptxdl=True,
              xfersrc=True,
              xferdest=True,
              svcstatus=a.status.upper(),
            ),
        current_app.logger.debug(f'bankacctinfo: {bankacctinfo}')

        acctinfo = ACCTINFO(
            desc=a.accountName,
            bankacctinfo=bankacctinfo,
          )
        current_app.logger.debug(f'acctinfo: {acctinfo}')

        banks.append(acctinfo)

I correctly fill the BANKACCTFROM and BANKACCTINFO but when I try to fill ACCTINFO(), i get a message that says:
ValueError: ACCTINFO must contain at least one of dict_keys(['bankacctinfo', 'ccacctinfo', 'bpacctinfo', 'invacctinfo'])

I'm pretty sure is something i'm not getting correct, pretty sure I'm unable to understand how ListAggregate works.
Could you please help me?

Thanks a lot.