TC_si_sched_13 BTS_Tests

Regression

Failing for the past 1 build since #593

Took 9.1 sec (from Titan)

Stack Trace

"BTS_Tests.ttcn:4612 : Error: Insufficient SI in array: 3 < 4"
      BTS_Tests.ttcn:9487 BTS_Tests control part
      BTS_Tests.ttcn:4999 TC_si_sched_13 testcase