Universal 203:

Original: No set of case marking elements both participate in agreement and fail to express subject-object relations.
Standardized: IF a relational marker (case, adposition) participates in agreement, THEN it will not fail to express subject-object relations.
IF a relational marker (case, adposition) fails to express subject-object relations, THEN it will not participates in agreement.
Keywords: case, adposition, agreement, grammatical relations
Domain: inflection, syntax
Type: mutual implication
Status: achronic
Quality: absolute
Basis: Russian (Slavic, Indo-European), Evenki (Tungus), Japanese (Japanese-Ryukyuan), Tagalog (W. Malayo-Polynesian, Austronesian), Amharic (Semitic, Afro-Asiatic), Estonian, Karelian, Vepsian (all Finnic, Uralic)
Source: Kilby 1981: 116 (G)

FP