Check here for intra-switching (same fund house) charges:
http://www.fundsupermart.com.my/main/buyse...alesCharge.svdo

For Eastspring Investments, switching is free.

As for the credit system, this is how it works (roughly):

Initially u invested RM10,000 in an equity fund, sales charge u paid is RM200
Then u switch all to bond fund which has 0% sales charge
The sales charge that u paid (RM200) on the equity fund goes to a "credit system"
So that later on when u switch back to equity fund, u get waived from any sales charge up to that initial RM200