Multi Line Credit check at Order Fulfillment level

Summary:

Here is the scenario

Customer credit limit - 1000

Sales order has two line as follows

L1 - 900

L2 - 200

both line went for credit check part of the fulfillment first line will pass as 900 < 1000 (customer credit limit available)

Once the second line will go for credit check line amount 200>100 ( 1000-900) is higher than available customer credit limit as out of customer actual credit limit of 1000, first line consumed 900

now the question is, as the second line failed credit validation, does system will also release the credit for first line and customer credit limit will be back to 1000

if the next order come with 500 will it be approved, or this will not be approved as previous order already consumed?