When debugging data issues with GoldenGate one of the first things I like to do, is to check if the source and target tables are the same.
There are several different ways we can do that, but I find the easiest and quickest way to check this is using SQL Developer in conjunction with SQLcl commands. It also gives you all the indexes, columns, and references.
e.g. info+ <table name>
More references on SQL developer and SQLcl you can visit: https://www.thatjeffsmith.com