Cant delete chackpoint

I have a vm on hyper-v 2012R2 (not update) with a
backup checkpoint that I can not delete. The checkpoint was created by veeam
during backup. There is no opting in the GUI to manually delete the checkpoint.
I ran the backup again and it was succesfull however it did not delete the
checkpoint. What can I do? the checkpoint is growing quite rapidlly

http://1drv.ms/1k7NVB4

BR

Aviv