FRANKFURT (Reuters) – German business software maker SAP said it was buying technology firm Fieldglass as it continues aggressive growth of its internet-based services offering. Chicago-based Fieldglass, which has 350 employees, offers cloud-based services for procuring and managing contingent labor and services, SAP said in a statement on Wednesday, without saying how much it was paying for the company. It said it expected the transaction to close in the second quarter. (Reporting by Maria Sheahan)