GST INVOICE NOT SHOWN IN GSTR 1

Check if the supplier has reported the invoice: Verify if the supplier has reported the invoice in their GSTR-1.If not , the client might need to wait for the supplier to do so or take crrective actin based on GST rules. 

2. Reconcile ITC with GSTR-2A (auto-populated from supplier GSTR-1). If the invoice is missing in GSTR-2A , consider reaching out to the supplier. 

3. Correct in subsequent returns if needed: If the error is noticed after filing GSTR-1 for the period, corrections can be made in subsequent returns or through other mechanisms as per GST guidelines.