Message type: E = Error
Message class:  WR - Messages for Revaluation at Retail 
Message number: 159
Message text: Also enter a document number or a date of retail price change
You want to select retail revaluation document items with status A (to
be counted) and use materials managed on a value-only basis as the
template for partial revaluation at retail.
You did not, however, enter any document number or date of the retail
price change. At least one of these two parameters is required for the
selection (also see the online help for retail revaluation document
templates on the initial screen of partial revaluation at retail).
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Enter a document number and/or a date for the retail price change or
use the F4 help on the retail revaluation document field to select the
required retail revaluation document items with status A.
Error message extract from SAP system. Copyright SAP SE.
SAP Error Message WR159: "Also enter a document number or a date of retail price change"
Cause: This error occurs in SAP Retail pricing or condition maintenance when you attempt to create or change a retail price condition record without specifying either a document number or a date of retail price change. SAP requires one of these fields to track the validity or reference of the price change. The system needs a reference to either: A document number (e.g., a price change document or approval number), or A date indicating when the retail price change takes effect. If neither is entered, the system cannot process the price change, hence the error. When does it occur? During creation or modification of retail price conditions (e.g., in transaction VK11, VK12, or retail-specific pricing transactions). When maintaining retail price changes in the SAP Retail module (IS-Retail). When the configuration or user input requires a reference to a price change document or date, but
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