Siemens SIMATIC BATCH Operating Manual page 413

Starting individual recipe elements
Select the recipe element in the control recipe, right-click and then select "Start Step" in the
shortcut menu.
Rules
A recipe element within a control recipe can only be started when the recipe element in the
next higher hierarchy level has already been started. For example, a ROP at the next level
down from a RUP can only be started when the RUP has already been started.
It is always possible to abort or halt a lower level recipe element.
Within a sequence, only one recipe element may be processed at one time, This means, for
example, that if a recipe operation (ROP) is running, no other ROP can be started at the same
time, in the same sequence or within the same RUP. An attempt to start another ROP would
be rejected with an error message.
SIMATIC BATCH V8.2
Operating Manual, 02/2016, A5E35958174-AA
BATCH Control Center
9.8 Batch control
413