Repeating group format

Dear,
The issue is , when we re trying to make a MarketDataRequest, 269 field(MDEntryType) should be sent as ‘repeating group’ of 267 (NoMDEntryTypes).

we re sending 267 = ‘2’ but , we could not figure ‘how to send repeating group values’ out in the request.

(when we send 269 just like 267, as a normal field i mean, its not accepted - “58”:“Tag not defined for this message type”)

do you have and string format of MarketDataRequest as an example ?

Which FIX engine and language are you using? Or are you constructing the message as a plain String?
Edit: as for example messages. You probably can find some with Google or the like.

Which two values of MDEntryType(269) do you want to send? If it is only a single value, then you need to send NoMDEntryTypes(267)=1.