Hi Kunal,
Sales goals are always captured in organization’s base currency. We cannot change currency on Sales Goal record.
So you need go Settings > Business Management > currencies to check which is base currency.
Open the currency (my example is USD, in your example, you need select SAR), it told me it was the base currency and the exchange rate is read only if it is.

And in the goal form, when you insert money, you don’t need write currecy name like ‘SAR’, you just need insert Currency amount (number).

Regards,
Leah Ju
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