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After reviewing the content, the supplier should make the corrections indicated by the Buyer and resend steps D1-D3 for re-approval by clicking the 
button again.
Step D4 - Root Causes
In this step, the supplier is asked to identify the root cause of the problem that led to the complaint. The view includes the following sections:
- Root Causes
- Percentage Contribution: If there are multiple sources of the problem, they should be listed and their percentage contributions proportionally assigned. Important! The sum of percentage points must equal 100% - otherwise, the system will not allow sending step D4 for approval.
- Problem Description: Here, the supplier must descriptively state what is or is not the cause of the problem.
- Complaint Causes: Options to select 'External/Internal'.
- Location: If it is possible to indicate the place where the problem originated, this field should be filled.2.Supplier's Decision - Complaint Rejection
- The supplier must decide whether to:
- Yes - Acknowledge the complaint and take responsibility. This answer will lead to the next steps in the complaint process, i.e., D5-D8.
- No - The supplier believes they are not the source of the problem reported in the complaint. This answer - upon Buyer/QA acceptance - will result in the end of the complaint process and its automatic closure at step D8.
- Questions
If the reported complaint pertains to the following questions, the supplier is asked to provide answers:
- What in the process caused the defective material?
- What in the process allowed the shipment of defective material? Both fields are optional for the supplier to fill.
- Root Causes - Attachments
The supplier is asked to attach documentation, photos, or other documents confirming the correctness of the root cause diagnosis. Adding attachments is optional to send the step for approval.
Submission and Approval
After filling in the sections mentioned above, the supplier should submit step D4 for approval by the Buyer/QA. The potential approval scenarios will be similar to steps D1-D3:
- D4 Approved: The supplier proceeds to fill in steps D5-D6.
- D4 Rejected: The supplier should review the comments and make the necessary changes in the D4 form. After making the corrections, the approval process is repeated.