Google N-gram Corpus Counts
╭─ーーーーーーー─┬───────┬───────╮
│ 体系だった　　 │ 9,581 │ 84.3% │ - adding
│ 体系立った　　 │ 1,780 │ 15.7% │
├─ーーーーーーー─┼───────┼───────┤
│ 体系だった知識 │   695 │ 89.4% │
│ 体系立った知識 │    82 │ 10.6% │
╰─ーーーーーーー─┴───────┴───────╯

@@ -3,0 +4,3 @@
+<k_ele>
+<keb>体系だった</keb>
+</k_ele>

体系立って	1056

I think this is probably OK. The meaning is certainly not obvious from the parts. I see the 新英和大辞典 has 組織立った as a gloss for "systematic", indicating that 立った is being used that way.
BTW, I suspect our 立つ entry could do with some work. We have 3 senses and GG5 & 中辞典 have 11 and 12.

@@ -12 +12,3 @@
-<gloss>structured</gloss>
+<gloss>structured (e.g. information)</gloss>
+<gloss>integral (e.g. knowledge)</gloss>
+<gloss>systematic</gloss>

native friends mentions the word 'integral' as in integral knowledge

https://www.weblio.jp/content/体系立てる

encountered as 'taikeidatta chishiki wo eyou to omottara..'

cannot find a satisfactory english word for it though.. (and not sure about adj-f)

体系立った	1780
体系立てる	280 (note the reference is for this one)