Is there an ODataV4 field length lmit?

Hi

Does anybody know if there is a field length limit on ODataV4 in Acumatica?

I have created a Custom Data Field in a Customization Project and I can’t see the field via ODataV4. I can see other Custom Data Fields via ODataV4 in the same DAC. 

I can add the field to a GI and use OData (not v4) to retrieve it but can’t see it via V4.

The field is 2000 characters long and I wondered if this was why it was not being shown when I pull the DAC with ODataV4.

Thanks

Matt