Yes, it should have source data issue, but the rapid mart job makes use of SAP table as source and ideally we have no control over the data in that table.
However, let us analyze more and share the comments
The hierarchy values 2000000->2010000->1->101->0101000000->0101010000->0101010010->0010200000->?->BACN->1> input to
transform <Hierarchy_Flattening> form a circular dependency.
It is coming from SAP table in standard rapid mart job.