I am using an internal openmama based MD api which has a UPA based bridge to TREP to send contributions to Refinitiv. I can use it to send page whole line updates, but I cannot get partial line updates to work. I can see a hex representation of a partial page update when I subscribe showing the control characters and column position in the line to put the update. Using the same format to contribute does not work. Note I am interested in the underlying format of the row field value I need to send, not documentation on the way to do it in RFA etc. as I am not using any Refinitiv APIs.