As the accused: get advice before questioning, clarify the means and purpose of the conduct.
Coercion under § 105 StGB requires that another person is forced, by force or by a dangerous threat, to perform an act, to tolerate something or to refrain from acting. The decisive question is often whether the means used, in relation to the purpose pursued, offends against accepted moral standards. From a legal perspective, what was actually said and done should be clarified precisely before the first questioning.
Do not make a statement on the matter before you have obtained access to the file and sought advice. Especially in business or private disputes, the line between permissible assertion of interests and punishable coercion lies in the detail.