BPMN — restriction to be placed on the number of tokens

I believe that there should be a restriction placed on the number of tokens that may be present on a given wire. If a situation arises where there are several tokens on a given wire coming into a merge gateway then there is a correlation problem between the multiple incoming tokens on one wire and tokens arriving on other wires. Such correlation becomes a serious business problem when documents are associated with token flows. E.g. if there are two tokens on one wire and two tokens on another wire then there are two different ways of correlating the merging tokens. Proposed resolution: restrict the number of tokens on a given wire in a single instance of a process to zero or one.

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