1. A computer-implemented method of operating a production installation having at least two computer-operated engineering systems arranged in an operating sequence, said method comprising: generating a first output file by a first computer-operated engineering system, said first output file comprising information on an operating variable of at least one component of the installation, transmitting the first output file to a second computer-operated engineering system by exporting the first output file by the first computer-operated engineering system and importing the first output file by the second computer-operated engineering system, operating the installation using a second output file produced by the second computer-operated engineering system using the first output file; providing first origin data that describes an origin of the first output file from the first computer-operated engineering system and second origin data that describes an origin of the second output file from the second computer-operated engineering system, and second linkage data describing a linkage of the second origin data to the first origin data; transmitting a changed operating variable of at least one component of the installation from the second computer-operated engineering system to the first computer-operated engineering system using the second linkage data; and generating an error message when the changed operating variable is not transmitted from the second computer-operated engineering system to the first computer-operated engineering system, wherein the first computer-operated engineering system is a tool for providing a pipeline and instrumentation plan of the production installation, and the second computer-operated engineering system is a tool for providing a circuit diagram of the production installation.