PO, Invoice, LC and Bill of Lading Don't Agree: Which Document Should You Fix?

You compare the transaction and find four versions of the truth.

The PO says one thing. The LC says another. The invoice says something slightly different. The Bill of Lading says something else again.

The instinct is often:

Which document should we change?

That is usually one question too early.

First ask:

What was supposed to happen, what actually happened, and which document is giving us the wrong story?

Start with the transaction, not the PDFs

Consider:

Detail	PO	LC	Invoice	BL
Incoterm	CIF Hamburg	CIF Hamburg	CIF Hamburg	—
Quantity	500 cartons	500 cartons	500 cartons	500 cartons
Model	WP-50	WP-50	WP-40	Pumps
Freight	Seller pays	—	Included	Freight Prepaid

The obvious exception is the invoice model.

But before changing it, check the physical shipment.

If the exporter actually shipped WP-40, changing the invoice to WP-50 creates a more serious problem.

If WP-50 was shipped and the invoice contains a typo, the invoice may be the source of the error.

Same mismatch. Completely different action.

1. Identify the requirement

For documentary compliance, the LC is the primary documentary requirement.

But the LC is not the whole commercial transaction.

The PO or contract may contain terms that the bank never examines.

That creates two separate questions:

Banking question:
Does the presentation satisfy the LC and applicable documentary rules?

Commercial question:
Does the transaction satisfy what buyer and seller actually agreed?

Both matter. They are simply not the same test.

2. Identify the evidence of what actually happened

The most editable document is not automatically the least reliable one.

If quantity differs, check:

• packing list
• transport document
• warehouse/shipping record
• inspection or weight certificate where relevant

If the route differs, check:

• BL/AWB
• booking/shipping instruction
• actual carrier movement

If price differs, check:

• PO/contract
• accepted amendment
• invoice
• LC amount and unit price where stated

The goal is to find the source of truth for that fact.

Then correct the document that misrepresents it.

3. Remember that banks do not examine the whole commercial relationship

Under UCP 600, banks examine documents against the credit and applicable rules.

A purchase order may be commercially important while being irrelevant to the bank’s documentary examination if it is not part of the required presentation.

That does not mean your internal review should ignore it.

Example:

PO: 24-month warranty
LC: silent
Invoice: 12-month warranty

The bank may have no documentary reason to refuse solely because the PO differs.

But the buyer and seller may have a real commercial problem.

Classification

Commercial inconsistency — review required

Evidence: PO vs invoice
Action: Confirm agreed warranty before sending the invoice
Owner: Sales / documentation
Deadline: Before presentation or buyer acceptance

This is exactly why “LC compliant” and “transaction correct” are not synonyms.

4. Different wording is not always a mismatch

UCP 600 allows data to be expressed differently provided it does not conflict where consistency is required.

So:

LC: Stainless steel coils Grade AISI 304
BL: Stainless steel coils

is not the same as:

LC: NEW diesel generators
BL: USED diesel generators

The first may simply be a more general description on a transport document.

The second changes the meaning.

Do not repair harmless differences.

Every unnecessary document change creates another chance to introduce a real error.

5. Sometimes the document is correct and the LC is wrong

Suppose the PO and actual shipment say:

Port of discharge: Rotterdam

But the LC says:

Hamburg

You cannot solve the underlying problem by changing a truthful BL to Hamburg if the cargo is actually going to Rotterdam.

The credit itself may need amendment.

This is especially important before shipment.

Issue type

Documentary requirement conflicts with commercial/shipping reality

Action: Seek LC amendment rather than “fixing” truthful documents
Owner: Beneficiary / applicant / banks as required
Deadline: Ideally before shipment

6. Fix the source, then regenerate downstream documents

A useful hierarchy is:

Agreed transaction → LC requirement → actual shipment → documentary evidence

If the commercial agreement changed, update the relevant instruction and credit where necessary.

If the shipment changed, update documents that should reflect the shipment.

If one document contains a clerical error, correct that document.

Avoid making four documents agree with a fifth document that was wrong in the first place.

A practical mismatch example

Finding:

PO and LC show 1,000 units. Invoice shows 950. Packing list and BL show 950.

Possible interpretation:

The shipment may genuinely be 950 units.

Now ask:

Are partial shipments permitted?
Does any quantity tolerance apply?
Was the PO commercially amended?
Is the invoice correctly reflecting the actual shipment?

The answer may be:

• no document needs “correction”
• the LC still permits the drawing
• the PO needs commercial follow-up

or:

• shipment is outside the LC quantity terms
• amendment may be needed

A field difference alone does not tell you which.

The 60-second “which document do I fix?” check

1. What differs?

State the exact field.

2. What was contractually agreed?

PO / contract / accepted amendment.

3. What does the LC require?

Separate banking requirements from the sale contract.

4. What actually happened?

Shipment, quantity, route, goods, date.

5. Which document misstates reality or the applicable requirement?

That is usually where correction begins.

6. What stage are we at?

Before shipment, after issuance or after presentation?

The stage may change the available remedy.

Three things to take back to your desk

Do not make documents agree by force.
Make them agree with the transaction.

A PO mismatch is not automatically an LC discrepancy.
Commercial and documentary problems need different treatment.

Sometimes the LC needs fixing, not the document.

The useful question is:

Which piece is wrong relative to the actual transaction and the requirement it is supposed to evidence?

This guide is educational and does not replace examination of the specific credit, applicable ICC rules, international standard banking practice, contractual requirements or professional advice relevant to a particular transaction.