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As per analysis on our side, it seems that this issue is related to the account group (Z001) of the vendor used on the Purchase order that have an issue. I've checked the all the vendors under this account group and checked if there are any Purchase order that is similar to the purchase order which have a posted invoice but I didn't found any.
Could you please confirm if you have used this type of Vendors (account group Z001) for this particular MIRO transaction?, if yes, please provide a sample.
If is possible, can you create a new vendor with similar details to vendor 1012070000 but under a different account group so that you may post an invoice via MIRO.