Bonus share

I have to look up, as far I’m concerned, CRR has a purpose ie to redeem shares and not to issue new shares out of it. So the company uses general reserves. 

Here are some company laws related to bonus issue: https://www.caclubindia.com/experts/bonus-issue-reserves--981390.asp

MAthematically, it doesn’t compensate for partially paid shares as no cash is involved like you said. But this strategy can be used to persuade  shareholders pay off their final call. 

The list in the above link- source of reserve used in issue must be followed. It doesn’t make any difference to partially paid shares because, a bonus issue will not take place not unless it is converted to fully paid up shares. After fully paid, the issue of bonus uses standard procedure.

To convert them into fully paid, upon receiving the final call money, it is credited to capital account and there is no involvement of General reserve. After this, when bonus is issued, general reserves are debited, I have an easy illustration here: https://ca-intermediate.in/wp-content/uploads/2018/08/Chapter-6-Accounting-for-Bonus-Issue-and-Right-Issue.pdf

I have sent you a link through PM which has an easy illustration, capital is credited when final call is complete. Then general reserves is debited while issuing bonus sharesu