Basic: 
simply find last transaction of konto and check if matching

Single-Strain: 
go through all transaction of konto and revalidate from lower to higher transaction id

Multi-Strain: 
validate also last of cash inflow from another kontos

Multi-Strain-Complete:
revalidate all transaction of konto and linked kontos

Full-Group: 
revalidate all transactions of group

Full: 
revalidate all transactions of group and all linked groups