Validation of Manually-Created Documents You can extend the validations that are, by default, performed for all postings. This is done by checking manually-created documents with your own (custom) validation methods.
In validation customizing, you have defined the validation methods and rules you want to use.
In document type customizing, you have specified these validation methods for the document header, line items, and/or the entire document.
The following elements of a manually-created document can be checked with validation methods:
Document Header
The validation method checks the characteristics that are fixed in the header.
Document Line Items
The validation method checks each line item.
An example would be a check that certain users do not post currency values beyond certain currency limits.
The Entire Document
The validation method checks the entire document.
An example would be to ensure that the total amount of depreciation that is posted to assets with certain subassignments is equal to the total amount in the corresponding depreciation expense item.