Hello Jo,
According to the error messages you are getting you don't have all required tables in HDB - or your DB connection is pointing to the wrong DB schema, or the user maintained in the DB connection doesn't have sufficient authorization.
Can you access any tables in ECC_SLT_HAN from SE16H? If you specify the DB connection there, hit Enter and then use F4 on the Table field, it will give you a list of all the tables it finds under that DB connection.
Generally speaking, you should activate all the accelerators you are interested in via HDBC. Make sure you save that and then restart HDBC. Then you click on one of the main nodes (e.g. Financials) and switch to tab Replication Tables. You can copy the list of table names to LTRC and simply paste it there...
If you switch to the tab Replication Options in HDBC you will see which of the required or optional tables for that context are found for your DB connection.
Hope this helps,
Ralph