803 SAP Message of Class B1 No function module has been assigned to the business object type &

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803(B1) - No function module has been assigned to the business object type &

Message number 803 of class B1 is used to display message "No function module has been assigned to the business object type &" and can be triggered using the following ABAP code:

DATA: lv_val1(100) TYPE C.
lv_val1 = '123'.

    MESSAGE E803(B1) WITH lv_val1. "Error message example

    MESSAGE W803(B1) WITH lv_val1. "Warning message example

    MESSAGE I803(B1) WITH lv_val1. "Information message example
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What causes this issue

The function module has not been assigned to business object &v1& in
the distribution model. The function module name is required todetermine the receiver of dependent message types.

How to fix

Assign the name of a function module to the business object in the
distribution model. Using these names the values of filter objects inthe master record of the object can be read.
Message text extract from SAP system. Copyright SAP SE.

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