The primary study objective is to compare efficacy of Insulin glulisine, once a day at breakfast vs. Insulin glulisine given once a day at main meal in combination with insulin glargine + OAD in terms of change in HbA1c, from baseline to endpoint for the individual patient. The aim of the study is to demonstrate two-sided equivalence between the two therapy regimens receiving two different injection timing of Insulin glulisine.