Weird VALIDATE event in FORM

The Form's validate behavior can be controlled by a form-level validation attribute.
You can use set_form_property to set it to PROPERTY_TRUE and PROPERTY_FALSE.
When the focus of the program leaves the current validation_unit, The validation_unit validate event is triggered.
The level of Validation unit is set through the validation unit attribute of form, which has the following attribute values:
Default, form, block, record, item.
That is to say, when validation unit is set to block, the validate will be triggered only when the focus leaves a block.
Based on the different valiation unit, it can be divided into validate form, validate block, validate record, and validate item.
Validate form: All blocks in validate form
Validate block: all records in the validate block
Validate record: if the record is valid, it is stopped. Otherwise, all items in the record of validate are triggered.
WHEN-VALIDATE-RECORD Triiger
Validate item: if the current item is valid, it is stopped; otherwise, the standard check of this item is executed, including LOV (if
Validate_from_list attribute is true), and The WHEN-VALIDATE-ITEM Trigger is triggered.
You can also use the validate method to force the validate data (Note: if the form's validation attribute is set to false, the validate method cannot also validate the data). This method has a parameter, you can set the validate level: Default_scope, form_scope, block_scope, record_scope, item_scope.
Validate trigger mainly has 2, WHEN-VALIDATE-ITEM and WHEN-VALIDATE-RECORD, 2 trigger has form level and block level, and WHEN-VALDATE-ITEM also has item level.