1. What is Documentation Inconsistency?

A. Patent vs Latent Ambiguity
Under Sections 93 to 98 of Indian Evidence Act, 1872:

• Patent ambiguity - apparent on face of document. e.g., Clause 5 says "delivery in 30 days" and Clause 12 says "delivery in 60 days". Sec 93 bars oral evidence to explain it.
• Latent ambiguity - document looks clear but becomes inconsistent when applied to facts. e.g., "I sell my white house" but you own two white houses. Sec 95-97 allows extrinsic evidence.

B. Types of Inconsistency

1. Internal Inconsistency: Between clauses of same agreement. e.g., Main Agreement vs Schedule.
2. External Inconsistency: Between two linked documents. e.g., LOI vs Purchase Order vs General Conditions of Contract.
3. Factual Inconsistency: Document vs conduct of parties, or vs statutory law.

2. Core Principles Courts Apply

Courts follow a hierarchy of interpretation:

1. Rule of Harmonious Construction & Reading as a Whole
The thumb rule is that a document forming a written contract should be read as an entire document and as far as possible, as mutually explanatory. You cannot pick one clause and ignore another. The attempt is to harmonize.

2. Doctrine of Repugnancy - Earlier Clause Prevails
If after harmonious construction, two clauses are still irreconcilable, the earlier clause prevails over the later one. This is a rule of last resort.

3. Contra Proferentem - Interpretation Against the Drafter
When words are truly ambiguous and the court is unable to decide by ordinary principles, the ambiguity is resolved against the party who drafted it.
This is a Latin maxim: Verba Chartarum Fortius Accipiuntur Contra Proferentem.

4. Business Efficacy & Reasonable Person Test (Lord Hoffmann Principles)
Interpretation should be what a reasonable person having all background knowledge would understand. It must make business common sense, not result in absurdity.

5. Falsa Demonstratio Non Nocet
A false description does not vitiate if the intent is clear from the rest of the document.

6. Section 92 Proviso of Indian Evidence Act
Oral evidence is generally excluded to contradict a written contract, but 6 provisos allow evidence of mistake, fraud, illegality, want of consideration, separate oral agreement, or custom.

3. Leading Case Laws

A. Indian Supreme Court Cases

1. General Assurance Society Ltd. v. Chandumull Jain & Anr., AIR 1966 SC 1644
This is the locus classicus. SC held:

"In other respects there is no difference between a contract of insurance and any other contract except that in a contract of insurance there is a requirement of uberrima fides... and the contract is likely to be construed contra proferentem that is against the company in case of ambiguity or doubt."
Foundation for all insurance interpretation cases.

2. United India Insurance Co. Ltd. v. Pushpalaya Printers, (2004) 3 SCC 694
Reiterated contra proferentem with force. Words were ambiguous whether impact damage by a lorry was covered. SC held ambiguity should be resolved in favour of insured. The rule protects the insured from the unfavourable interpretation of an ambiguous term to which it did not agree.

3. Rashtriya Ispat Nigam Ltd. v. Dewan Chand Ram Saran, (2012) 5 SCC 306
Major limitation. SC held principle of contra proferentem does not apply to commercial contracts where both parties are business entities and negotiated terms on equal footing. It applies to standard form / boilerplate / adhesion contracts where one party has negligible bargaining power.

4. Bank of India & Anr. v. K. Mohandas & Ors., (2009) 5 SCC 313
VRS scheme had inconsistency - did pension include past service? Court applied reasonable and harmonious construction, giving effect to intention of parties and avoiding anomalous results.

5. Nabha Power Ltd. v. Punjab State Power Corp Ltd., (2018) 9 SCC 386
SC imported 5 principles of Lord Hoffmann from Investors Compensation Scheme v. West Bromwich and added Business Efficacy Test. If literal meaning leads to commercial absurdity, court can depart to give effect to business purpose.

6. Ram Kishorelal v. Kamal Narain
SC emphasized harmonious interpretation first, and only if repugnancy is irreconcilable, earlier clause doctrine will apply. This is now codified in contract drafting as "Order of Precedence Clause".

7. Sushilaben Indravadan Gandhi v. New India Assurance, (2021) 7 SCC 151
Re-affirmed contra proferentem in insurance - beneficial interpretation to be given to army personnel insurance scheme.

8. Shree Ganesh Petroleum, Rajgopal v. SBI
SC held that an erroneous interpretation of a contract by an arbitrator should not lead to setting aside of award where interpretation is reasonable. A plausible interpretation, even if not the best one, is not perverse.

B. English Leading Cases Applied in India

9. Investors Compensation Scheme Ltd. v. West Bromwich Building Society, 1 WLR 896 (House of Lords)
Lord Hoffmann laid 5 principles of interpretation - matrix of facts, reasonable person, background knowledge, business common sense. Cited in every Indian commercial contract dispute.[1998]

10. Chartbrook Ltd. v. Persimmon Homes Ltd., UKHL 38
Court can correct clear drafting mistake through interpretation if it is clear what the parties intended and what mistake was made. Business common sense prevails over literal syntax.[2009]

4. How Courts Resolve Inconsistency - Practical Test

When faced with inconsistent documents, Indian Courts do this step-by-step:

1. Is there a Priority Clause? Most modern contracts have "In case of conflict, Agreement shall prevail over Schedules, Technical Specs over Drawings". Court will enforce it.
2. Can you Harmonize? Read both clauses together to make them co-exist. e.g., 30 days is for standard items, 60 days for imported.
3. Business Efficacy: Which interpretation makes commercial sense and serves the main purpose?
4. Against Drafter? If still ambiguous and it is a standard form, apply Contra Proferentem against the drafter/insurer/employer.
5. Void for Uncertainty? Under Sec 29 Indian Contract Act, if inconsistency is so fundamental that agreement cannot be made certain, it is void.

Practical Tip for Drafting to Avoid Litigation:

Always add:

"Order of Precedence: (a) This Agreement (b) Special Conditions (c) General Conditions (d) Technical Specifications (e) Price Schedule. In case of inconsistency, the higher in order shall prevail."

That one clause eliminates 80% of documentation inconsistency disputes.