"Build" spell does not work on invisible unit

[ToldYouSo]

My shade unit is invisible, but due to that it can't actually use the skill "build". Is there a way to fix that, without removing invisibility or making "build" ability by triggers?

 

[Chaosium]

Did you give the repair ability to your shade? Depending on the race of the unit it won't be able to build if it lacks that ability

 

[ToldYouSo]

Did you give the repair ability to your shade? Depending on the race of the unit it won't be able to build if it lacks that ability

I did. But as long he is invisible somehow unit is unable to use building skill