What error message are you getting, Mark? If TWS API complains about the fact that your client does not support fractional sizes, you need a client API version with MAX_VERSION of at least 163. Client API features and their respective version numbers are defined in the EClient class.
Client version 163 (aka MIN_SERVER_VER_FRACTIONAL_SIZE_SUPPORT) was introduced with TWS API 10.10.03 which came out in mid-2021. So there is no need for you to sign up for the beta version. Transition to fractional sizes is going on for years now. But you will need to make changes to your client to support the "decimal" data type IBKR uses for fractional sizes. There are lot's of posts about that in the group.
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On Mon, Mar 20, 2023 at 09:56 AM, mark collins wrote:
I'm probably still being a bit slow here, but how do you get the client to be able to read the data without signing up to a github research project and using a beta release?
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Best wishes,
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M
