Hello Lode,

I am assuming your are using dropdown view of category which allow only one category to be selected. Try the following code:

add_filter( 'bblpro_validation_errors', function ( $errors, $data, $prepared_post_data, $form_id ) {

	if ( ! function_exists( 'bbl_ppp_form_has_paid_posting_enabled' ) || ! bbl_ppp_form_has_paid_posting_enabled( $form_id ) ) {
		return $errors;
	}

	if ( is_wp_error( $errors ) && $errors->has_errors() ) {
		return $errors;
	}

	// Do not validate if save draft action.
	if ( isset( $data['action'] ) && 'bblpro_save_draft' == $data['action'] ) {
		return $errors;
	}

	// Replace with your taxonomy.
	$tax                 = 'category';
	$taxonomy            = get_taxonomy( $tax );
	$term_data           = isset( $data['tax_input'] ) ? wp_unslash( $data['tax_input'] ) : array();
	$selected_term       = isset( $term_data[ $tax ] ) ? absint( current( $term_data[ $tax ] ) ) : 0;
	$selected_product_id = isset( $data['bblpro_ppp_product_id'] ) ? absint( $data['bblpro_ppp_product_id'] ) : 0;

	if ( empty( $selected_product_id ) || empty( $selected_term ) ) {
		return $errors;
	}

	/**
	 * array (
	 *    product_id => category_id
	 * )
	 */
	$product_category_mapped_ids = array(
		5 => 16,
		6 => 18,
	);

	if ( ! isset( $product_category_mapped_ids[ $selected_product_id ] ) ) {
		// what should we need to return here. If selected product not in mapped array.
		return $errors;
	}

	if ( $product_category_mapped_ids[ $selected_product_id ] != $selected_term ) {
		$errors->add( "bbl_tax_$tax", sprintf( __( '%s is invalid. Please select matched with selected product', 'buddyblog-pro' ), $taxonomy->labels->singular_name ) );
	}

	return $errors;
}, 20, 4 );

Note: Please replace taxonomy and mapped product and term id array as per your configuration. Please give it a try. Please make sure the product and category field is required.

Regards
Ravi

Hello Lode,

I am assuming BLOG, NEWS and ANNOUNCEMENTS are the categories and in the following code, I am mapping WooCommerce products with these categories so that at the time of form submission I can make sure that the Category and selected WooCommerce products are similar.

/**
	 * array (
	 *    product_id => category_id
	 * )
	 */
	$product_category_mapped_ids = array(
		5 => 16,
		6 => 18,
	);

If this is not the case. Please let me know what are BLOG, NEWS and ANNOUNCEMENTS.

You can put the code in the ‘bp-custom.php’ file. If you do not know what is bp-custom file you can refer to the following blog post:

https://buddydev.com/docs/buddypress-guides/what-is-bp-custom-php/

Regards
Ravi

Regards
Ravi