We have an MRL (11.5 patch 4) that has several extract dictionaries, and sometimes a single form will use different extract dictionaries depending on the forms list it is used in. That has always worked fine, except now if you drag a field onto a section via the Extract Bar, the field's unique identifier from a given XDD gets appended to the end of the source name for the field. As a result, the field only populates when using the forms list that uses that specific extract dictionary, forms lists that use other extract dictionaries cause RP to bomb out because the unique identifiers are different. Is there a setting that omits the unique identifer from the source name? Manually removing the identifer from the Source name is cumbersome and since the ID isn't necessary to get the field to populate, I don't understand any case where it would be beneficial.
I'm familiar with the sequence number (but not your specific error). There is an ellipsis button on the Source Name attribute under the Rule section of a Field object. When this button is clicked, you are presented with the list of fields in the XDD, and there is a check box to generate the search/selection without the unique ID. This function may only be available in a later version of Studio, however - I don't have an 11.5 system handy for me to look at.