FRANKFURT, Sept 10 (Reuters) - The European Central Bank made the following announcement regarding its latest liquidity providing operation: Longer Term Refinancing Op.-Announcement Intended Volume: Reference Number: 20120137 Min Allotment: Transaction Type: Reverse Transactions Fixed Rate: 0.75 % Operation Type: Liquidity Providing Min Bid Amount: Defined by NCB Procedure: Standard Tender Max Bid Limit: Tender Date: 11/09/2012 11:15 Max Bids per Cpty: 1 Time for Submission of Bids: 09:30 Start Date: 12/09/2012 Maturity Date: 10/10/2012 Duration (days): 28 Auction Type: Fixed Rate Tender Allotment Method: