I'm noticing that the $system accessor bundle does not contain the sample_t1 and sample_t2 members if the bundle stems from an explicit simultaneous-equation system ('system' block, as opposed to 'var' or 'vecm'). See for example:
equation LRM const LRY(-2) LRM(-3)
equation LRY const LRY(-1)
Is this just an oversight like I'm guessing?
(Remember that sample_t1 and t1 can differ depending on available pre-sample values in the dataset and on the lag structure in the system.)