NetSuite cannot read the date or posting period
Compare the saved CSV text with the importing user’s date format and the intended date or period.
The posting period cannot be matched
Message looks like
Invalid postingperiod reference key for subsidiary 1
What it means
The posting period on the row does not match an existing period name, often because spreadsheet formatting changed the text.
Import context: Expense reports.
Check this first
Compare the value with the exact period name and format the Posting Period column as text.
Show the steps
Steps for this error
- Compare the Posting Period value with the exact name of an existing period.
- Check the CSV formatting for that column. In a spreadsheet, set the Posting Period column format to Text so no punctuation or date handling is added.
- Retry one report.
Documentation checked September 16, 2026.
An effective date is not accepted
Message looks like
Invalid effective date reference key
What it means
The effective date on the row is not readable in the importing user date format, so the reference fails.
Import context: General imports.
Check this first
Compare the saved CSV date text with the importing user date format and confirm the intended year.
Show the steps
Steps for this error
- Copy the effective-date text from the saved CSV rather than the spreadsheet display.
- Compare it with the importing user’s date format and confirm the intended year. A default value on the Effective Date mapping can also supply the properly formatted date. To stop a spreadsheet from converting date text, enter it as formula text in the =”Sept 2013” style.
- Correct one unambiguous date and retry that row.
Documentation checked September 16, 2026.
Amortization dates are reversed or misread
Message looks like
Amortization end date cannot be before amortization start date
What it means
The amortization start and end dates are reversed, or the fields are mapped in an account where revenue recognition does not expose them.
Import context: Journal entries.
Check this first
Compare the two date columns and confirm the start date comes before the end date.
Show the steps
Steps for this error
- The Start Date and End Date fields on a journal require the Revenue Recognition feature; check whether they should be mapped at all.
- Compare the two columns: the start date must be before the end date.
- Correct the dates and retry one journal.
Documentation checked September 16, 2026.
A script or workflow could not process the date
Message looks like
TypeError: Cannot find function getFullYear in object NaN
What it means
A date on the row is malformed, classically a year with an extra digit such as 3/29/20014, and NetSuite's date handling fails on it. The message names script internals, but the trigger is usually the date value.
Import context: Sales orders.
Check this first
Check the mapped date values for malformed years before investigating any script or workflow named in the full error.
Show the steps
Trace the date-processing failure
- Preserve the complete error from the CSV response.
- Identify the affected row and all mapped date fields.
- Confirm the saved CSV contains the intended date text, watching for a malformed year such as 3/29/20014.
- If the error names a script or workflow, inspect its date parsing and empty-value handling on the Sales Order form and CSV execution context.
- Test one corrected row. Do not change every account date preference based only on this message.
Documentation checked September 16, 2026.
The transaction date is invalid
Message looks like
Invalid date value (must be entered as mm/dd/yyyy)The transaction date you specified is not within the date range of your accounting periodYou have entered an Invalid Field Value x/x/xxxx for the following field: trandate
What it means
The transaction date is not readable in the importing user's date format, or it falls outside the accounting period being posted to.
Import context: Transactions.
Check this first
Compare the saved date text with the importing user's format and the intended period.
Show the steps
Steps for this error
- Copy the transaction-date value from the saved CSV and confirm the intended calendar date.
- Compare it with the importing user’s date format and the date range of the selected accounting period.
- Correct either the date text or the intended period, then retry one transaction.
Documentation checked September 16, 2026.
Related errors
- Event dates or times are missing or invalid
- Numbers or identifiers changed in the CSV
- NetSuite CSV import says an amount is missing
- The vendor bill total disagrees with its lines
Book a free 30-minute look at your import error
Bring the error and your file to a screen share and I will dig into it live. Thirty minutes is usually enough to find what is wrong and tell you what fixing it takes. Sometimes that settles it on the call; when it does not, you leave with a straight answer instead of a mystery. No cost and no obligation.
An import that keeps failing is often the first visible sign of a larger setup problem. Most of my client work starts exactly here: somebody mid-import, a file that will not load, and nobody on their side to email. If a migration or implementation sits behind this error, that is the work I do every week.