Custom message overload another one

[caiomajdalani]

Context

• node version: 8.12.0
• joi version: 13.7.0
• environment (node, browser): Node
• used with (hapi, standalone, ...): Express-joi 0.3.1

What are you trying to achieve or the steps to reproduce ?

tax: joi.object({
                    fee: joi
                        .number()
                        .integer()
                        .positive()
                        .required()
                        .error(
                        () =>
                            `property fee is required and it must be a positive integer number.`,
                    ),
                    mdr: joi
                        .number()
                        .integer()
                        .positive()
                        .required()
                        .error(
                        () =>
                            `property mdr is required and it must be a positive integer number.`,
                    ),
                })
                .required()
                .error(() => `property tax is required`),

Request

"tax": {
"fee": -1,
"mdr": 0
}

Which result you had ?

"child "tax" fails because [property tax is required]"

What did you expect ?

child "tax" fails because [child "fee" fails because [property fee is required and it must be a positive integer number.]]

[Marsup]

Duplicate of #1528 so same answer. Added a new syntax to support that use case as people don't seem to understand what error does.