Can't edit or view data on custom table in AX7

I created a new simple table in AX7 VM:

Allow edit on fields is set to yes.

I also created form for that table:

Allow edit (on data source) is set to yes, fields on grid are also set to enable edit.

But when I run that form (no errors, no best practices warning) I can't edit data on the grid, which looks like that:

I don't know if it is related, but when I open table browser, it displays no data:

VS2015 is in administrator mode.
What is interesting Table Browser also doesn't display any data on any other table (for example CustTable), but I am sure there is some data.