How can I update amount of a AMC SIP?
Is stopping the SIP the only option?
Does stopping SIP has any other consequences ?
As mentioned in this support page, it is not possible to modify/update a AMC SIP -
In an AMC SIP, the minimum investment amount is as specified by the AMC. The AMC SIP is not created internally in our system. Hence, you will not be able to modify/pause/step-up the SIP. If you’d like to delete or cancel your SIP, it can be done only 2 days prior to the SIP’s next installment date.
That appears to be the only way currently -