No parallel resources for Greek Grammars

logosed said:

I tried creating a collection but still they do not group together.

Did you check the box in your collection rule that says "parallel resources"or something like that?

EDIT: a screenshot:

(note: using the paperclip icon of the forum editor will actually show a picture file)

EDIT2: this seems to be a bug. I see the same as you, the parallel resource button in the one grammar resource you picked (and which is the only one I've seen that has it) claims there are no parallel resources - and all others I've checked didn't have that button in the firstplace. You may want to edit your thread title and put "BUG: " in front of it. But then again, this seems to be a "design bug". Smyth has an index for "Greek Grammar (Smyth)" while Mounce's BBG has an index for BBG and Greek Grammar Beyond the Basics has an index for GGBtB etc. They are not really parallel - what's in Smyth' §123 has no bearing at all to what's in another Grammar, so they are not parallel like bibles, commentaries or lexicons are, sharing the same index. No idea why Smyth's offers a parallel resource button, this seems buggy unless there's another version that runs along the same index. To really work as parallel, someone needed to build a synthetic index structure and apply it to all Greek grammars (here's the topic of third declension nouns, here's the chapter on movable nu etc)   

logosed said:

I did check that. It made no difference.

Yes, sorry, see my edits above. Basically grammars can't be parallel resources like other types of books do, since they don't share a common index.

logosed said:

Thanks. I wonder why then one of my grammars (Goodwin) appears as a parallel resource with my Greek lexicon.

It has an appendix of Greek vocabulary which is indexed after Greek Headwords, like a lexicon, that's why. 

logosed said:

Smyth has a similar appendix but does not appear.

It's not indexed: you see in the Information tab of the resource - or when you're located in the appendix, you see that the locator field in the navigation bar shows only page, not the Greek headwords like Goodwin's do.

No idea why Smyth should show a parallel resources button - maybe there's a translated version of it, or a reprint edition with the same index, or really a bug. Unfortunately Blass (not BDF, but Blass as sole author) is only indexed by page - there I own the German and the English edition, and if they had a Blass Grammar index, those two could really run as parallel resources.