mlp and form 6198

[mlpabc1980]

TT on Part 1 of form 6198 is included all previous years carry forward losses .   It wont allow me to uncheck box stating that at risk limitations existed from previous years.   

Also, part 2 is confusing.   Does line 6 adjusted basis include partners share of changes in nonrecourse liabilties?

[mlpabc1980]

I should add that i am revising already file tax return.