[Cost Management] FOCUS ServiceName is missing in some scenarios

🐛 Problem

FOCUS ServiceName is empty for the following scenarios:

• Marketplace purchases (EA)
• Savings plan purchases (MCA)
• Rounding adjustments (MCA)
• Reservation purchases (MCA)
• MACC shortfall (MCA)
• Azure credits (MCA)

👣 Repro steps

1. Export FOCUS data from Cost Management
2. Filter rows where ServiceName is empty

🤔 Expected

ServiceName should have a value

ℹ️ Additional context

The following query identifies known scenarios:

Costs
| where isempty(ServiceName)
| project-reorder ChargeCategory, PublisherName, x_PublisherCategory, CommitmentDiscountType, x_SkuDescription, SkuId, SkuPriceId, x_SkuDetails, x_SkuServiceFamily, x_SkuMeterCategory, x_SkuMeterSubcategory, x_SkuMeterName
| extend scenario = case(
    ChargeCategory == 'Purchase' and x_PublisherCategory == 'Vendor', 'Marketplace purchase',
    ChargeCategory == 'Purchase' and isnotempty(CommitmentDiscountType), strcat(CommitmentDiscountType, ' purchase'),
    x_SkuDescription in ('RoundingAdjustment', 'Azure credits', 'MACC Shortfall'), x_SkuDescription,
    ''
)
| summarize count(), max(ChargePeriodStart) by scenario, x_BillingAccountAgreement | order by count_ desc

🙋‍♀️ Ask for the community

We could use your help:

1. Please vote this issue up (👍) to prioritize it.
2. Are there any additional scenarios that you are seeing ServiceName empty in FOCUS data?
3. Leave comments to help us solidify the vision.

Start with the Kusto query in the issue to reproduce the empty ServiceName rows and group them by scenario. Trace the Cost Management FOCUS export mapping for Marketplace purchases, commitment purchases, rounding adjustments, reservations, MACC shortfall, and Azure credits. Done means ServiceName is populated for each listed scenario and the query no longer finds those expected cases.