How to control sequence of Function Modules processed in update task?

Hello,
I've some questions regarding following process that needs to be extended: a Function Module (FM) 'Save' calls several other FM e.g. 'X1' and 'X2' in update task. Those update modules are independent from each other and write data to the database that finalize the save process.
Now a third FM 'X3' needs to be called in update task. This one is also independent from 'X1' and 'X2' but it calls a further FM 'X4' in background task as separate unit which starts a job. This job  requires the data from FM 'X1' and 'X2' already persistent on the database. By the way: the FM 'X3' triggers the Access Control Engine (ACE) notification that calculates the authorization data in the mentioned job. Therefore this process needs to be the last FM call in update task in the queue of calls in FM 'Save'.
Questions:
(1) Is it possible to control the process sequence of the FM 'in update task' simply by the sequence they are called in FM 'Save'.
(2) Presumed that all FM beside 'X3' have processing type "Update with immediate start" or "Immediate start, no restart" (in short  V1) would it be another solution to specify FM 'X3' with type 'Delayed' to control the process sequence? When a delayed FM will be processed?
(3) Is it uncritical to call in FM 'X3' (already running in update task) the FM 'X4' with addition in background task as separate unit  that furthermore starts a job by an event? I'm afraid that this nesting could lead to unexpected errors.
Thank you in advance for your help!
Best regards,
Oliver

ya it will this be in  the same sequence only...........
Regards
Anbu

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