Validate migration process with kettle

Hi everything,

Guys, I have a problem and i hope that you can help me. I am new with Kettle. Now I will explain my problem. I have two subsystems each with several tables. The A subsystem is a relational database with three tables, the B subsystem also is a relational database with six tables. Both are in the same database motor than is SQL Server. The information of A Subsystem was migrated to B SubSystem. One register in A can generate one register in each of tables of B. Now i need to validate than the migration were performed correctly. I have been searching on Pentaho Kettle and i see than i can perform this job with a transformation, but i don't know how to perform the remaining work. I need to validate for example than the column 1 from the table A1 from the Subsystem A is table is equal to column 1 from the table B1 from the Subsystem B, the column 2 from the table A1 from the Subsystem A is table is equal to column 1 from the table B3 from the Subsystem B.

I had thought to perform a query to table A1 from the Subsystem A and store each this columns in something like as Array after start a comparison with the destiny column knowing this:

SubSystem -Table- -Column- SubSystem -Table- -Column-
A A1 1 B B1 1
A A1 2 B B2 2
A A1 3 B B1 5
A A1 4 B B3 2

I need check out with this map for example than the data is identical in A-A1-1 == B-B1-1. If the data is not identical, i must register an error in a log table. Some idea for to perform this job with the tool`s kettle?.

I appreciate your colaboration and I hope that some can help me.

Thanks!!!!.

Pd. Sorry by my irregular english.