Different Results in FIX API for Identical Demo Accounts

Hello!

While working with two demo accounts on the cTrader platform via FIX API, I encountered an anomaly. Both accounts are using the same FIX server:

• Host: demo-uk-eqx-01.p.ctrader.com
• Port: 5211
• SenderCompID: demo.pepperstone.xxxx

The issue is that the two accounts return different results for the same FIX API request.

Example 1: Error When Placing an Order

Sent FIX Message:

8=FIX.4.4|9=158|35=D|49=demo.pepperstoneuk.4184****|56=CSERVER|34=3|52=20250121-00:46:24|11=90beca28-4c52-4527-bf09-378b71ae9239|55=2|54=1|60=20250121-00:46:24|38=1000.0|40=1|10=112|

Received Response:

8=FIX.4.4|9=233|35=j|34=3|49=CSERVER|50=TRADE|52=20250121-05:06:14.625|56=demo.pepperstoneuk.4184****|57=TRADE|58=TRADING_BAD_VOLUME:Order volume 1000.00 is smaller than group minVolume=999999999999.00.|379=a47f07cb-fcd1-4e5e-8a1c-203235c42b3c|380=0|10=058|

Example 2: Successful Order Execution

Sent FIX Message:

8=FIX.4.4|9=156|35=D|49=demo.pepperstone.5032****|56=CSERVER|34=3|52=20250121-00:45:32|11=e84c197d-92c4-4847-99f1-445dfcaa3a34|55=2|54=1|60=20250121-00:45:32|38=1000.0|40=1|10=190|

Received Response:

8=FIX.4.4|9=237|35=8|34=3|49=CSERVER|50=TRADE|52=20250121-00:45:32.356|56=demo.pepperstone.5032****|57=TRADE|11=e84c197d-92c4-4847-99f1-445dfcaa3a34|14=0|37=270053489|38=1000|39=0|40=1|54=1|55=2|59=3|60=20250121-00:45:32.319|150=0|151=1000|721=142024767|10=101|

Questions:

1. Why do two demo accounts (both on the same FIX server) return different results for identical requests?
2. How can this discrepancy be resolved to ensure consistent behavior, especially regarding the minimum trade volume? Is it really can be minVolume=999999999999.00.??

Thank you in advance for your assistance! Please let me know if you need further details.