The configuration options you are trying ot use do not exist.
This is not a bug.
Please use the SA user's mailing list for support

(In reply to Schroeffu from comment #0)
> When i change my spamassassin.conf with the following values

There is no support in the SA distribution for any config file of that name. Perhaps you need to address this to whoever created the packaged version you are using? 

> required_body_points = 2
> required_head_points = 2

1. That would be incorrect syntax in a SA configuration file, e.g. local.cf or user_prefs. 

2. There is no documentation of those variables in the SA distribution and they only exist in the operational code, where they are set to fixed values without reference to any config values. They are not intended for user configuration and are both set to 3 normally to avoid serious risks of mistraining by the autolearn mechanism. It is UNSUPPORTED and UNWISE to reduce those values. Obviously you are free to change the code you use to set them as you like on your own systems. 


> its saying while starting:
> 
> Aug 10 12:32:51.001 [176947] warn: config: failed to parse line, skipping,
> in "/etc/spamassassin/spamassassin.conf": required_body_points 2
> Aug 10 12:32:51.001 [176947] warn: config: failed to parse line, skipping,
> in "/etc/spamassassin/spamassassin.conf": required_head_points 2
> 
> Why can't I change the value to learn as spam/ham, with only 2 head/body
> points?

Because it is virtually a guarantee of autolearn breaking your Bayes database. 

Feel free to change the code you use on your systems and witness the resulting likely damage. 

> default values i found here:
> https://fossies.org/dox/Mail-SpamAssassin-3.4.1/
> classMail_1_1SpamAssassin_1_1Plugin_1_1AutoLearnThreshold.html

That is NOT SpamAssassin documentation. It's apparently a not-very-successful attempt to build documentation automatically from code while aggressively ignoring the actual documentation embedded in the code in a well-defined format. As a consequence it is incomplete, misleading, and badly formatted. 

You can get a much better documentation with the 'perldoc' command line tool or from the SpamAssassin or MetaCPAN websites. 

This is NOT a bug and to the degree that it could be reimagined as a request for enhancement, would be a very bad idea. I do not expect that even a working implementation to make these variables configurable would be accepted by the SA development community and PMC.

take a look at the flag autolearn_force in the actual documentation for Mail::SpamAssassin::Conf and Mail::SpamAssassin::Plugin::AutoLearnThreshold