Clarify the allegation from the file first.
Section 148 StGB aggravates the fraud allegation where the conduct is said to be aimed at recurring income. For suspects the key question is whether the authority can really prove a commercial structure or merely groups several incidents together.
The basic fraud offence is section 146 StGB. Section 148 StGB concerns the aggravated form of commercial commission. The focus is not only loss, but the alleged orientation towards recurring income.