There are two possible reasons. One is that we can only approve the amount of the receipt. Another is that you don’t have enough points to cover the total reimbursement amount.
For example, the amount of your receipt is $70. However, the amount you submit is $90. We can only approve the $70 shown in the receipt.
Or suppose you have $80 in your account, but you submit a reimbursement request for $100. In this case, you would only be approved for $80 instead of $100.