Owb first step

hi all,
i'm dealing for the first time with owb.
i'm doing some mappings in order to populate ods tables from staging tables (external tables).
in order to convert the type of a column i came across the anydata cast and tried to use it. since it gave me a bunch of errors i decided to use the expression module using the converting functions.
so here the first question: 1) what does the anydata cast module does? how can i use it?
when importing tables from oracle to owb i noticed that the column with type integer are converted in number. so here the second question: 2) why is that? is that normal?
during a mapping using the expression module i take a varchar2 variable and through the substr(field,1,3) function i put it into a char(3) variable since the end field it's char(3) type. if i start the mapping it gives me the error saying that the destination buffer is too small. however if i set the type to varchar2(3) that error does not occur. so here the third question: 3) why is that? giving this problem i get a lot of alert during the validation problem.
least but not last here question four: 4) where can i find a short description of the usage and what they are used for the module in the palette menu?
thx in advance
by the way, the owb version is 11g r2
Edited by: 908335 on 19-gen-2012 3.56

First of all many thanks - Nawneet for the reply !!
I have went through the link (all 7 chapters) that you provided and performed all the hand-on exercise as well, still I am not able to find a Direct solution to my problem.
With the info from the Link: We created the flat-file SOURCE module and external table in the TARGET module.
My Problem is to APPEND data in the existing table of the database, as one would have done through SQL-LOADER. My Flat file will keep on changing on daily basis and data must get append to 1 table (daily)
Many Thanks once again for your time,
A refer for a book or any other help will be grt help.

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