systemd | Requires statement with an instantiated service

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Maybe the work day is already to long. I can not find
a solution for following requirement.

How to apply a "Requires" with an instantiated service.

Example:

a@.service
b.service

a@.service is started as a@host1.service and b.service must be started
after a@host1.service but the unit will be differently parameterized
(depended of the region). So I want to generalize the requires statement.

My dropin file in ./b.service.d/dep.conf looks like

[Unit]
Requires="a@*.service"

This just produces following error:
'Failed to add dependency on "a@*.service", ignoring: Invalid argument'


I use also a Before=b.service statement for a@.service but that is not
enough.

Any hints?

--
Thanks,
Leon

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