diff --git a/modules/purchase_trade/docs/backlog/market-price-import-backlog.md b/modules/purchase_trade/docs/backlog/market-price-import-backlog.md
index 8c32485..f646ad3 100644
--- a/modules/purchase_trade/docs/backlog/market-price-import-backlog.md
+++ b/modules/purchase_trade/docs/backlog/market-price-import-backlog.md
@@ -4,7 +4,7 @@ Scope: code changes related only to `BR-PT-004 - Market Price Import`.
 
 ## PT-BL-001 - Enforce uniqueness at model level
 
-- Status: to be tested
+- Status: done
 - Implementation commit: `eaae2e5`
 - Priority: high
 - Source: [rules/market-price-import.md](../rules/market-price-import.md)
@@ -78,3 +78,17 @@ Scope: code changes related only to `BR-PT-004 - Market Price Import`.
   - result message separates business validation errors from parsing/technical errors
   - invalid workbook and missing required columns remain blocking `UserError`
   - row-level errors still let the import continue
+
+## PT-BL-006 - Fix missing default currency on created price index
+
+- Status: open
+- Priority: high
+- Source bug: [BUG-PT-001](../bugs.md#bug-pt-001---missing-default-currency-in-price-index-automatic-creation)
+- Source rule: [rules/market-price-import.md](../rules/market-price-import.md)
+- Requirement: when the market price import automatically creates a missing `price.price`, the created price index must have default currency `USD`.
+- Current behavior: the created price index can miss the default currency even though the import specification expects `USD`.
+- Expected code impact:
+  - `modules/purchase_trade/pricing.py`
+- Expected tests:
+  - automatic price index creation assigns `price_currency` to the `USD` currency record
+  - if the `USD` currency record cannot be found, behavior remains aligned with the rule for optional default references
diff --git a/modules/purchase_trade/docs/bugs.md b/modules/purchase_trade/docs/bugs.md
new file mode 100644
index 0000000..5447c2f
--- /dev/null
+++ b/modules/purchase_trade/docs/bugs.md
@@ -0,0 +1,63 @@
+# Bugs - Purchase Trade
+
+This file is the bug register for `purchase_trade`.
+
+## Workflow
+
+1. Register every new bug in this file with a stable bug ID.
+2. Create a matching backlog entry for every new bug.
+3. Link the bug entry to the backlog entry.
+4. When fixed, record the implementation commit in the backlog entry.
+5. Keep the bug entry as history and update its status.
+
+## Status Values
+
+- `reported`
+- `confirmed`
+- `backlog-created`
+- `in-progress`
+- `to-be-tested`
+- `done`
+- `rejected`
+
+## Bug Template
+
+```md
+### BUG-PT-001 - Short title
+
+- Status: `reported`
+- Area:
+- Reported date: `YYYY-MM-DD`
+- Reported by:
+- Related rule:
+- Backlog entry:
+- Severity:
+- Environment:
+- Description:
+- Steps to reproduce:
+- Expected behavior:
+- Actual behavior:
+- Evidence:
+- Notes:
+```
+
+## Bugs
+
+### BUG-PT-001 - Missing default currency in Price Index automatic creation
+
+- Status: `backlog-created`
+- Area: Market Price Import
+- Reported date: `2026-05-08`
+- Reported by: user
+- Related rule: [BR-PT-004 - Market Price Import](rules/market-price-import.md)
+- Backlog entry: [PT-BL-006](backlog/market-price-import-backlog.md#pt-bl-006---fix-missing-default-currency-on-created-price-index)
+- Severity:
+- Environment:
+- Description: during market price import, if a price index should be created, then the default currency defined to USD is missing.
+- Steps to reproduce:
+  - import market prices with `Create price index if missing` enabled
+  - include a `price_index` that does not already exist
+- Expected behavior: the automatically created `price.price` has default currency `USD`.
+- Actual behavior: the automatically created `price.price` has no default currency.
+- Evidence:
+- Notes:
diff --git a/modules/purchase_trade/docs/documentation-management.md b/modules/purchase_trade/docs/documentation-management.md
index 24471fe..045a947 100644
--- a/modules/purchase_trade/docs/documentation-management.md
+++ b/modules/purchase_trade/docs/documentation-management.md
@@ -62,6 +62,35 @@ Example:
   - expected code impact
   - expected tests
 
+Backlog status values:
+
+- `open`: identified, not started yet
+- `in-progress`: currently being worked on
+- `blocked`: cannot progress until a dependency or question is resolved
+- `implemented`: code or documentation change made, not yet validated
+- `to-be-tested`: implemented and waiting for targeted validation in the right environment
+- `tested`: targeted validation passed
+- `done`: tested, committed, and no further action expected
+- `rejected`: intentionally not implemented
+
+Default workflow:
+
+```text
+open -> in-progress -> to-be-tested -> tested -> done
+```
+
+Use `implemented` only when the change is made but no validation attempt has happened yet. Use `to-be-tested` when validation must happen in another environment or could not be completed locally.
+
+## Bug Management
+
+- Register every new bug in `docs/bugs.md`.
+- Use stable bug IDs such as `BUG-PT-001`.
+- Every new bug must have a matching backlog entry.
+- Link the bug entry to its backlog entry.
+- If the bug belongs to an existing feature backlog, add it there.
+- If the bug does not clearly belong to an existing feature backlog, create a dedicated backlog file under `docs/backlog/`.
+- When the bug is fixed, record the implementation commit in the backlog entry and update the bug status.
+
 ## Review Workflow
 
 For future development work: