diff --git a/app/modules/documents/agent_package.py b/app/modules/documents/agent_package.py
index d183230..03b8fad 100644
--- a/app/modules/documents/agent_package.py
+++ b/app/modules/documents/agent_package.py
@@ -4,7 +4,7 @@ import io
 from pathlib import Path
 import zipfile
 
-ERP_LOCAL_AGENT_VERSION = "1.26.2"
+ERP_LOCAL_AGENT_VERSION = "1.26.3"
 ERP_LOCAL_AGENT_NAME = "ERP Local Agent"
 RUNTIME_ROOT = Path(__file__).resolve().parent / "local_agent_runtime"
 _DETERMINISTIC_ZIP_TIMESTAMP = (2026, 1, 1, 0, 0, 0)
diff --git a/app/modules/documents/local_agent_runtime/erp_local_agent/__init__.py b/app/modules/documents/local_agent_runtime/erp_local_agent/__init__.py
index 759f64f..1a14052 100644
--- a/app/modules/documents/local_agent_runtime/erp_local_agent/__init__.py
+++ b/app/modules/documents/local_agent_runtime/erp_local_agent/__init__.py
@@ -1,2 +1,2 @@
-__version__ = "1.26.2"
+__version__ = "1.26.3"
 AGENT_NAME = "ERP Local Agent"
diff --git a/app/modules/documents/local_agent_runtime/erp_local_agent/accounting_store.py b/app/modules/documents/local_agent_runtime/erp_local_agent/accounting_store.py
index a3fb826..e8dc800 100644
--- a/app/modules/documents/local_agent_runtime/erp_local_agent/accounting_store.py
+++ b/app/modules/documents/local_agent_runtime/erp_local_agent/accounting_store.py
@@ -634,9 +634,13 @@ class LocalAccountingStore:
             raise ValueError("Accounting storage is not initialized for this client.")
         tally_guid = str(mapping.get("tally_guid") or "").strip()
         company_name = str(mapping.get("company_name") or "").strip()
-        mapping_id = int(mapping.get("id"))
+        mapping_id = (
+            int(mapping.get("id"))
+            if mapping.get("id") not in (None, "")
+            else None
+        )
         if not tally_guid or not company_name:
-            raise ValueError("Active Tally mapping is incomplete.")
+            raise ValueError("Accounting Mirror company identity is incomplete.")
         started = _utc_now_iso()
         counts: dict[str, int] = {}
         run_id = None
@@ -688,12 +692,16 @@ class LocalAccountingStore:
             raise ValueError("Accounting storage is not initialized for this client.")
         tally_guid = str(mapping.get("tally_guid") or "").strip()
         company_name = str(mapping.get("company_name") or "").strip()
-        mapping_id = int(mapping.get("id"))
+        mapping_id = (
+            int(mapping.get("id"))
+            if mapping.get("id") not in (None, "")
+            else None
+        )
         date_from = str(transactions.get("date_from") or "").strip()
         date_to = str(transactions.get("date_to") or "").strip()
         vouchers = transactions.get("vouchers") or []
         if not tally_guid or not company_name:
-            raise ValueError("Active Tally mapping is incomplete.")
+            raise ValueError("Accounting Mirror company identity is incomplete.")
         if not date_from or not date_to:
             raise ValueError("Transaction sync date range is missing.")
 
@@ -1047,7 +1055,42 @@ class LocalAccountingStore:
     def depreciation_preview(self, client_id: int, *, tally_guid: str, fy_start: str, fy_end: str) -> dict:
         if not self.exists(client_id):
             raise ValueError("Accounting storage is not initialized for this client.")
-        mapping = self.get_active_mapping_by_guid(client_id, tally_guid)
+        try:
+            mapping = self.get_active_mapping_by_guid(client_id, tally_guid)
+        except Exception:
+            mapping = {}
+            with self.connect(client_id) as db:
+                mapped = db.execute(
+                    """SELECT *
+                       FROM tally_company_mapping
+                       WHERE client_id=? AND is_active=1
+                       ORDER BY id DESC LIMIT 1""",
+                    (int(client_id),),
+                ).fetchone()
+                if mapped:
+                    mapping = dict(mapped)
+                else:
+                    identity = db.execute(
+                        """SELECT company_name
+                           FROM tally_ledgers
+                           WHERE tally_guid=? AND trim(COALESCE(company_name,''))<>''
+                           ORDER BY id LIMIT 1""",
+                        (str(tally_guid or "").strip(),),
+                    ).fetchone()
+                    mapping = {
+                        "id": None,
+                        "client_id": int(client_id),
+                        "tally_guid": str(tally_guid or "").strip(),
+                        "company_name": str(identity["company_name"] or "").strip() if identity else "",
+                        "is_active": 1,
+                        "mirror_only_identity": True,
+                    }
+            if not str(mapping.get("company_name") or "").strip():
+                raise ValueError(
+                    "Accounting Mirror is ready, but its company identity could not be resolved "
+                    "for depreciation analysis. Refresh the mirror once and retry."
+                )
+
         start = date.fromisoformat(str(fy_start)); end = date.fromisoformat(str(fy_end))
         if start > end: raise ValueError("Financial-year start cannot be after end date.")
         with self.connect(client_id) as db: