[Vuejs]-Bootstrap-vue table, Formatter callback error: You may have an infinite update loop in a component render function

The formatter callback is only intended to change how the value is displayed to the user, not change its value.

If you want to be able to change the value, I’d suggest using a slot for the value property and use v-model on a form component within the slot:

<template v-slot:cell(value)="data">
    <input type="text" v-model="data.value"/>
</template>