CarMax EDI 204 Load Tender

Schema Reference

19 segments · X12 204 Motor Carrier Load Tender

ISA01 Authorization Information Qualifier

M ID 2-2

ISA02 Authorization Information

M AN 10-10

ISA03 Security Information Qualifier

M ID 2-2

ISA04 Security Information

M AN 10-10

ISA05 Interchange ID Qualifier

M ID 2-2

ISA06 Interchange Sender ID

M AN 15-15

ISA07 Interchange ID Qualifier

M ID 2-2

ISA08 Interchange Receiver ID

M AN 15-15

ISA09 Interchange Date

M DT 6-6

ISA10 Interchange Time

M TM 4-4

ISA11 Repetition Separator M MIN 1 MAX 1 ID: I65 Type is not applicable; the repetition separator is a delimiter and not a data element; this field provides the delimiter used to separate repeated occurrences of a simple data element or a composite data structure; this value must be different than the data element separator, component element separator, and the segment terminator ISA12 Interchange Control Version Number

M ID 5-5

ISA13 Interchange Control Number

M N0 9-9

ISA14 Acknowledgment Requested

M ID 1-1

ISA15 Interchange Usage Indicator

M ID 1-1

GS01 Functional Identifier Code

M ID 2-2

GS02 Application Sender's Code

M AN 2-15

GS03 Application Receiver's Code

M AN 2-15

GS04 Date

M DT 8-8

GS05 Time

M TM 4-8

GS06 Group Control Number

M N0 1-9

GS07 Responsible Agency Code

M ID 1-2

GS08 Version / Release / Industry Identifier Code

M AN 1-12

ST01 Transaction Set Identifier Code

M ID 3-3

ST02 Transaction Set Control Number

M AN 4-9

B202 Standard Carrier Alpha Code

O ID 2-4

B204 Shipment Identification Number

O AN 1-30

B206 Shipment Method of Payment

M ID 2-2

B2A01 Transaction Set Purpose Code

M ID 2-2

B2A02 Application Type

O ID 2-2

L1101 Reference Identification

C AN 1-50

L1102 Reference Identification Qualifier

C ID 2-3

L1103 Description

C AN 1-80

G6201 Date Qualifier

C ID 2-2

G6202 Date

C DT 8-8

G6203 Time Qualifier

C ID 1-2

G6204 Time

C TM 4-8

AT5 Loop Repeat: 6

AT503 Special Handling Description

C AN 2-30

RTT01 Rate/Value Qualifier

M ID 2-2

RTT02 Freight Rate

M R 1-9

NTE01 Note Reference Code

O ID 3-3

NTE02 Description

M AN 1-80

S5 Loop Repeat: 999

S501 Stop Sequence Number

M N0 1-3

S502 Stop Reason Code

M ID 2-2

G6201 Date Qualifier

C ID 2-2

G6202 Date

C DT 8-8

G6203 Time Qualifier

C ID 1-2

G6204 Time

C TM 4-8

N1 Loop Repeat: 1

N101 Entity Identifier Code

M ID 2-3

N102 Name

C AN 1-60

N103 Identification Code Qualifier

C ID 1-2

N104 Identification Code

C AN 2-80

N301 Address Information

M AN 1-55

N302 Address Information

O AN 1-55

N401 City Name

O AN 2-30

N402 State or Province Code

C ID 2-2

N403 Postal Code

O ID 3-15

G6101 Contact Function Code

M ID 2-2

G6102 Name

M AN 1-60

G6103 Communication Number Qualifier

C ID 2-2

G6104 Communication Number

C AN 1-256

L5 Loop Repeat: 99,999

L501 Lading Line Item Number

O N0 1-3

L1101 Reference Identification

C AN 1-50

L1102 Reference Identification Qualifier

C ID 2-3

L1103 Description

C AN 1-80

SE01 Number of Included Segments

M N0 1-10

SE02 Transaction Set Control Number

M AN 4-9

Automating CarMax EDI 204

Stacksync validates, transforms, and delivers your 204 transactions automatically — so your team can focus on operations, not EDI compliance.

Validate

Transform

Route

Monitor

Stacksync syncs incoming CarMax 204 Load Tenders directly to your TMS or dispatch system — so your operations team can accept or reject loads without switching between systems.

CarMax EDI 204 FAQ

Common questions about 204 Motor Carrier Load Tender transactions with CarMax.

How long does it take to set up CarMax EDI with Stacksync?

Most suppliers are fully connected and processing live CarMax EDI transactions within 3–5 business days. Stacksync's no-code setup means you don't need developers or EDI consultants — configure your field mappings through our visual interface, run a test cycle, and go live.

Do I need an existing VAN or AS2 connection to trade with CarMax?

No. Stacksync handles the entire EDI transport layer. We connect directly to CarMax's trading partner network through our certified connections. You don't need to manage a separate VAN subscription, AS2 certificates, or SFTP configurations.

How does Stacksync help with CarMax compliance?

Stacksync improves compliance scores by eliminating manual processing delays. Purchase Orders sync to your system in real time, ASNs are generated automatically when you ship, and invoices are validated with three-way matching before submission. Real-time monitoring alerts you to issues before they become chargebacks.

What EDI document types does Stacksync support for CarMax?

Stacksync supports all EDI document types required by CarMax — including Purchase Orders (850), Invoices (810), ASNs (856), PO Acknowledgments (855), and more. Our platform handles the full lifecycle from order to payment automatically.

Can I connect CarMax EDI to my existing ERP or WMS?

Yes. Stacksync integrates with any system that has a database or API — including SAP, Oracle, NetSuite, Microsoft Dynamics, and custom-built ERPs. Data flows bidirectionally between CarMax's EDI network and your system in real time.

What happens when CarMax updates their EDI specifications?

Stacksync monitors CarMax's EDI spec changes and updates our mappings proactively. When a change affects your integration, we notify you and apply updates — so you stay compliant without scrambling to decode new implementation guides.