How to handle premature in-turn call of a bet or raise when amt is not known?

[MikeB]

See one discussion of this topic here:
http://www.pokertda.com/forum/index.php?topic=1190.msg10440#msg10440

[BillM16]

Also, please watch the 2015 TDA Summit discussion that lasted about 20 minutes from Day #2 Part #4 beginning at the 23:05 minute mark. 

Here is the link to the video:  https://www.youtube.com/watch?v=bc_TpYIpiD0