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@inthehands
Yeah ... and that is why Traditional Configuration Management has Interface Control Working Groups so that someone can make sure they talk and crack some heads together if they don't play nicely.
The worst SNAFU I saw was when our customer (a very big mining firm) wrote their own description of the interface to our software and consulted neither the software documentation or ourselves and gave it to another contractor to build a big downstream system. A year or so later our system did something that is completely acceptable but wasn't in their specification and they tried to raise a defect notice against us. It took a couple of years of to-ing and fro-ing before they called a formal fault resolution meeting and the existence of the unsupported interface specification came to light.