Property mapping defines which properties of the calling process should be transferred into which properties of the called sub-process. This definition is done graphically inside a BPMN allocation diagram which may be assigned to the Independent sub process object.

P1, P2 and P3 are Occurrence copies of properties that are part of the parent process, S1-S3 are property objects that are part of the Independent Sub Process.

The properties P1, P2 and P3 are transferred into the properties S1, S2 and S3 of the Sub Process. After the Sub Process has been completed the content S1 is copied into P1, S2 is copied into P2 and S3 is copied (mapped) to P3.