Few question when trying to replicate data

Hey Experts!

I'm playing around with SLT and HANA - i did initial configuration and I want to move some data from ERP test system to HANA Database.

Unfortunatelly I have encountered several issue - and I have no clue how to deal with them.

All errors are taken from tcode LTRC -> Table Overview -> View errors.

Some tables are loaded to HANA succesfully, but other raises messages like those:

1) Missing trigger for table BSEG for MT ID 001. Replication suspended.

2) Error while generating runtime objects for Z_AUBSI_002 Syntax error in function module /1CADMC/OLC_100000000000218 Error message: Data object '_WA_IO_S_AUBSI' does not contain 'SLS_REL'.

3) When doing replication from external DATABASE (with Database Connection) to HANA, some tables have no Key Field. Does LT requires tables to have Key Fields? I recieve such message: Top level sender structure /1CADMC/L0000222 does not have key fields

Thanks for your help!

Moho