# The GRS-to-DPP Gap: Why Certificate Presence Is Not Product Proof

## Executive Summary

A valid GRS Transaction Certificate does not automatically validate every downstream product claim.  
The gap appears when certified input volume is not mathematically tied to garment-level output declarations.

## The Core Gap

Documentary compliance asks: "Do we have a certificate?"  
Verification compliance asks: "Does certified mass support this exact output quantity and claim?"

## Method: GSM x CW x YY

Reeco uses a practical textile conversion model to estimate and validate certified mass consumption:

- `GSM` = grams per square meter
- `CW` = cuttable width
- `YY` = yield and process conversion factors

The result is cross-checked against declared units and TC-certified kilograms.

### Mass-Balance Integrity Table

| Input | Computation | Output Check |
|---|---|---|
| Certified TC kg | Converted into allocable mass | Maximum claimable certified output |
| Product BOM and specs | `GSM x CW x YY` and unit quantities | Expected material consumption |
| Declared recycled content | Compared against allocable mass | Pass, warning, or hard block |

## Hard Block Logic

When cumulative certified consumption exceeds available certified mass, claim issuance is blocked (`RCO003`).  
No manual override should exist without a new valid TC or corrected production data.

## Why This Matters for EU Enforcement

ESPR and Green Claims direction moves toward substantiated, traceable, product-level evidence.  
A brand cannot rely on certificate possession if conversion logic is inconsistent at SKU or batch level.

## Capabilities Matrix

| Capability | Basic Document Platform | Reeco Approach |
|---|---|---|
| Store GRS certificate | Yes | Yes |
| Validate certificate format | Sometimes | Yes |
| Compute product-level certified mass | Rare | Yes |
| Enforce exhaustion block | Rare | Yes (`RCO003`) |
| Produce audit trail | Limited | Structured and exportable |

## FAQ

### Is GRS certificate validation enough?

No. It confirms certificate legitimacy, not product-level claim accuracy.

### Why use `GSM x CW x YY`?

It translates textile technical data into auditable mass consumption logic.

### What does a hard block prevent?

Over-allocation of certified claims beyond available certified material.