---
title: Delete all manual class bases for a rate file
summary: `clsManualClassBaseCollection.DeleteManualClassBasebyRateFileSeqNum` (`clsManualClassBaseCollection.vb:327-365`)
status: draft
owner: Technical Writer
last_reviewed: 2026-07-31
library: SAIF.Business.Policy.Rating
reference_type: package
operation_id: OP-007
trigger: A rate file is being withdrawn or reloaded
---

# Delete all manual class bases for a rate file

`clsManualClassBaseCollection.DeleteManualClassBasebyRateFileSeqNum` (`clsManualClassBaseCollection.vb:327-365`)

| Field | Value |
| --- | --- |
| **Operation ID** | OP-007 |
| **Trigger** | A rate file is being withdrawn or reloaded |
| **Inputs** | WCIS rate file sequence number |
| **Outputs** | Boolean success |
| **Primary components** | ``clsManualClassBaseCollection.DeleteManualClassBasebyRateFileSeqNum` (`clsManualClassBaseCollection.vb:327-365`)` |
| **Entry point** | `Business\SAIF.Business.Policy.Rating\clsManualClassBaseCollection.vb` |

## Steps

1. Build the text statement
2. Execute through the data portal.
3. Return `True` on success.
4. On any exception, **swallow it and return `False`** — no message is surfaced and no exception is
5. Use the related data-access statements and tables for this operation: [SQL-057](../sql/SQL-057-saif-business-policy-rating.md), [MANUAL_CLASS_BASE](../database-tables.md#manual_class_base).

## Process flow

The following diagram visualizes this operation's control flow.

```mermaid
flowchart TD
  Start([Trigger: rate file being withdrawn or reloaded]) --> S1[Build delete text statement]
  S1 --> S2[Execute through the data portal]
  S2 --> D1{Exception thrown?}
  D1 -->|No| S3[Return True]
  D1 -->|Yes, swallowed| S4[Return False - no message surfaced, no exception rethrown]
  S3 --> Done([Boolean success])
  S4 --> Done
```

## Failure and edge-case behavior
- Review the linked business rules and SQL documents for the validation or data-access conditions that can block this operation.

## Related documentation
- [Operations and processes](../operations-processes.md)
- [Business rules](../business-rules.md)
- [SQL catalog](../sql/index.md)
- [Database tables](../database-tables.md)

> **Note:** Statements marked with * were inferred from code structure, naming conventions, or
> contextual evidence where direct confirmation was not available in source artifacts. Statements
> marked with ** could not be confirmed; treat as unknown until verified.

## Sources
- `Business\SAIF.Business.Policy.Rating\clsManualClassBaseCollection.vb`