Which major institutional dispute originally triggered the primary schism between the Sthaviravadins (Theravadins) and the Mahasanghikas during the Vaishali council?

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The council at Vaishali was convened to resolve the Dasa-vatthuni (Ten Points) challenge. Vajji monks claimed certain practices like keeping salt in a horn or accepting gold/silver were permissible, which orthodox Sthaviravadins (elders) labeled as corrupt. When the elders condemned these as illegal, the progressive majority (Mahasanghikas) separated, forming a new sect.

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