Issues (bug?) with TrialService bulking - TRIAL_DURATIONS_MUST_NOT_OVERLAP

Hi, 

Thank you for releasing the DraftService and TrialService in the 201603 version, much appreciated! 

Question - using the trial service, is it not possible to bulk-mutate several operations (spanning several drafts and campaigns) in 1 batch or I'm experiencing a bug?

Python example

# /...../
trialService = client.GetService('TrialService', version='v201603')

#Note : unique names, unique  base-campaign-ids & unique draft-ids in each operation. All IDs are in the same account.

mut_ops = [{'operand': {
   'baseCampaignId': '......579',
   'draftId': 5910974510......L,
   'name': u'Something Unique',
   'trafficSplitPercent': 50},
  'operator': 'ADD'},
 {'operand': {
   'baseCampaignId': '.....1699',
   'draftId': 4503599627......L,
   'name': u'Something Unique2',
   'trafficSplitPercent': 50},
  'operator': 'ADD'},
 {'operand': {
   'baseCampaignId': '.....7699',
   'draftId': 3096224743......L,
   'name': u'Something Unique3',
   'trafficSplitPercent': 50},
  'operator': 'ADD'}]
 

# FAILS - For error details see below
trialService.mutate(mut_ops)

# WORKS
for op in mut_ops:
 trialService.mutate(op)

# Fails with WebFault: Server raised fault: '[TrialError.TRIAL_DURATIONS_MUST_NOT_OVERLAP @ operations[1].operand; trigger:'[3/29/16 3:41 PM - 12/31/37 7:59 AM]', TrialError.TRIAL_DURATIONS_MUST_NOT_OVERLAP @ operations[2].operand; trigger:'[3/29/16 3:41 PM - 12/31/37 7:59 AM]']'
# {'fieldPath': operations[1].operand, 'reason': TRIAL_DURATIONS_MUST_NOT_OVERLAP, 'trigger': [3/29/16 3:29 PM - 12/31/37 7:59 AM], 'ApiError.Type': TrialError, 'errorString': TrialError.TRIAL_DURATIONS_MUST_NOT_OVERLAP}
# {'fieldPath': operations[2].operand, 'reason': TRIAL_DURATIONS_MUST_NOT_OVERLAP, 'trigger': [3/29/16 3:29 PM - 12/31/37 7:59 AM], 'ApiError.Type': TrialError, 'errorString': TrialError.TRIAL_DURATIONS_MUST_NOT_OVERLAP}

Looking forward to your response. 

Best Regards

Mikael Rapp

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