disableOptionWhen

In the Relation Manager form I am using a Select. However, I want to disable the option that has already been used.

->disableOptionWhen(function (string $value) {
    /* CHECK IF $VALUE ALREADY EXISTS WITH SAME PRODUCT_ID */
    /* IF TRUE, DISABLE OPTION */
})

->disableOptionWhen(function (string $value) {
    /* CHECK IF $VALUE ALREADY EXISTS WITH SAME PRODUCT_ID */
    /* IF TRUE, DISABLE OPTION */
})